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elevate the rear to lower the midship

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  • 1 Post By Time Machine
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elevate the rear to lower the midship

Old 10-10-2019, 09:24 AM
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Default elevate the rear to lower the midship

need advice on setting up bunks



Seams like the majority of the vessels weight is on the back of main bunks, the front guide bunks Are holding up the hull from resting on the front of the main bunks by 1 gap.



I want to evenly spread/distribute the weight.



What should I try space up the front of main bunks its the same on opposite side.



This is a hardwareless trailer so theres no bunk height adjustment.



Additionally the hull does hang past the main bunks by like 8s & I have a long tongue where I could slide the bow stop post forward even more than 8s.I actually like the 8s hanging over because this is where I place my cut wood logs to elevating hull off the trailer.



Im thinking I have to elevate the rear to lower the midship, does this make sense? sure I'll have to back into the ramp farrer but thats ok w/ me remember long tongue.



After 3 years of use Im finding the rear tires are being worn abnormally fast, slite cupping but just tires tread being worn off where the fronts are like new.



This tamdun trailer bad on tires the 25 years of pulling my single axel I actuelly never worn tires out just replaced every 5 or so years w/ lots of tread left in fairness this vessel is a fraction of the bigger vessel's weight.

Thanks for any advice. STB









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Old 10-12-2019, 06:03 AM
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anyone interested in advicing setting up bunks.
w/ both rear tires off the gap between the bunks and hull have been reduced significatly down to 1/8"

I still think the rear needs raising to lower the midship.

since the guide bunks are holding the hull up from touching the bunks could I flip the main bunks from there current postion there side flip them essentially elevating the main bunks maybe this will tilt the bow downward enough so all of hulls weight is on front and back of bunks.
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Old 10-12-2019, 10:58 AM
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Originally Posted by Stevethebrain View Post
need advice on setting up bunks

Additionally the hull does hang past the main bunks by like 8s & I have a long tongue where I could slide the bow stop post forward even more than 8s.I actually like the 8s hanging over because this is where I place my cut wood logs to elevating hull off the trailer.


After 3 years of use Im finding the rear tires are being worn abnormally fast, slite cupping but just tires tread being worn off where the fronts are like new.
I'm certainly not a trailer expert, but I would consider moving the boat forward, and seeing how it sits. How is the tounge weight? I've always thought the more the better, up to a point. I've never had a problem with a heavy tongue, but I have experienced the wobble from a light tounge. If it were me, I would thing about going to the boar ramp, and moving the tounge forward a foot, and try winching it in to see how it sits? If you don't like it, launch the boat and move it back.

I recently set up my 17 whaler trailer, and it did take some time. That has the keel rollers, which may make it easier. I basically set up the rollers on the keel, and then moved the bunks up under the hull. Without adjustment, you may need to put blocks of wood or plastic under the bunks to space them up the way you want them.

Like I said though, I'm not an expert, and these are just some ideas to think about.
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Old 10-12-2019, 03:40 PM
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Before you start throwing time and money at a suspected problem, Id suggest you take the rig to a CAT scale, and get the axle weights.

If the weights are widely different, moving bunks isnt likely all its going to take to solve the problem. You may need to move the whole boat forward on the trailer, or move the axles back.

Do you have a picture of the whole rig?
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Old 10-13-2019, 06:27 AM
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Originally Posted by Time Machine View Post
I'm certainly not a trailer expert, but I would consider moving the boat forward, and seeing how it sits. How is the tounge weight? I've always thought the more the better, up to a point. I've never had a problem with a heavy tongue, but I have experienced the wobble from a light tounge. If it were me, I would thing about going to the boar ramp, and moving the tounge forward a foot, and try winching it in to see how it sits? If you don't like it, launch the boat and move it back. I've been moving her forward in the drivway then get rolling and slam on the brakes.

I recently set up my 17 whaler trailer, and it did take some time. That has the keel rollers, which may make it easier. I basically set up the rollers on the keel, and then moved the bunks up under the hull. Without adjustment, you may need to put blocks of wood or plastic under the bunks to space them up the way you want them.

Like I said though, I'm not an expert, and these are just some ideas to think about.
yes I agree I like the stability for the tad extra tongue weight. I conservatively estimate 280-not exceed 300LB TW.
yes I've inched the vessel forward apparently not enough will continue forward I've got plently of tongue.



I'm starting to think the guide bunks are designed to hold a % of the weight kindof like the tongue is 10-15% of total load.

are the main bunks designed to surpport the majority or all the vessels weight?

Originally Posted by The Peddler View Post
Before you start throwing time and money at a suspected problem, I’d suggest you take the rig to a CAT scale, and get the axle weights. are you suggesting weighting each axel individually? like at a truck stop?

If the weights are widely different, moving bunks isn’t likely all it’s going to take to solve the problem. You may need to move the whole boat forward on the trailer, or move the axles back.

Do you have a picture of the whole rig?

currently both rear wheels are off so no to recent image. waiting onparts to reassemble.

additional infor.
the trailer frame is level w/ ground. but just looking at the vessel it appears to be tilted back. so is the triangle piece that connects the leaf springs when this triangle is level doe's that indicate equel weight to each axel.

the gap inbetween the hull and front of bunk has created vibration at expressway speeds which was resolved or significantly reduced by shoving in a spaced block of plywood into this gap then I pull down at bow pulpit w/ a ratchet strap this also helps snug hull at the bow post stop

. this was temporary fix experiment. then I read raising the front of main buck actuelle adds rear weight.

it's already hard enough to embark from trailer I'd prefer to not elevate the vessel as it sits on bunks plus tow vehicle rear wheels usaley never get closer than 1' to water at launch.

last resort would be cutting the guide post upright or are there thinner PVC type guide bunks. I've actually seen quite a few trailers w/ just main bunks but these vesesls appear higher than they should be sitting on trailer.

Thanks Guy's for advicing

Last edited by Stevethebrain; 10-13-2019 at 07:16 AM.
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Old Today, 02:43 AM
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I believe the solution is spreading the guide bunks wider will effectively lower the midship.this will also ease embarkment dis- embarkment while on trailer. a little adjust guide bunks move load w/ bow stop max3" forward hopefully load the front & keep the rears loaded.

here's the plan for adjustment on the driveway place floor jack at the front of keel remove the guide bunks lag screws adjust outward untill midship contacts front of main bunks game over. right.
w/load a properly loaded trailer will I still hear leaf spring rattle?


will report back after I adjust. hope this helps the next slob w/ setting up vessel properly on trailer.

Last edited by Stevethebrain; Today at 03:24 AM.
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