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  #11  
Old 03-06-2022, 08:30 PM
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arizonian arizonian is offline
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Surrey, BC or Surrey, UK?

I like rectangular tube sections for trailers out here in the desert. YMMV
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  #12  
Old 03-06-2022, 10:29 PM
SuzukiSamurai SuzukiSamurai is offline
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Surrey BC.
(Canada eh!)

Someone on here "stole" my usual forum username of westcoaster....
Them the breaks...

Couple items.
Tube and tongue...

Not that concerned about the tube rusting through. If I cap the ends and not drill holes or tap screws it should last as long as I will need it to. It isn't exposed to the salt roads as it is a summer use only thing.


Tongue weight.
This is very much a "single purpose" item. It won't be hauling dirt or building supplies. it is intended to pack my boat, motor, gas and maybe one or two large game animals in the fall should I ever be fortunate enough...
I need the trailer to be reasonably light on the tongue where I can lift and maneuver the trailer if necessary as none of the places it will be used are paved.

The tongue will be extraordinarily long by any "normal" convention for it's mannerism when reversing with a long wheelbase pickup. A "twitchy" trailer is a pain in the rear on a narrow road with a camper in the bed of the pickup...

The long tongue by itself will have a certain weight bias to the front. Add other essentials like a spare tire and trailer loading. There will be no shortage of weight on the tongue.

The boat riding around upside down on the trailer by itself can be used to tip the balance to the front, to the rear, or directly over the tires simply by pushing it backward or forward on the trailer.

12' aluminum boat over an 8' box still has 4' of aluminum boat that can be used to set tongue weight.

I attached an image of the 4x6 trailer I built in 1997. Framing will be basically the same with the axle in the middle with a very slight rear bias. I think this one is an inch or two to the rear of center on the box.
Frame is made of 2x2 1/8 wall box. Sides are thicker sheet steel bolted in place. floor is pressure treat plywood.
I have simply outgrown this trailer and would like to add a few features to the next one like a front side door with sliding drawer for the boat motor.

Apologies for the sideways nature of the following pic...
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  #13  
Old 03-07-2022, 08:53 AM
JBFab JBFab is offline
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Capping the tube is worse. You are trapping condensation inside the tube. If you truly do seal the ends not only will you accelerate rusting, but likely cause the tube to bulge when that condensation freezes.

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  #14  
Old 03-07-2022, 09:32 AM
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There is a standard formula for tongue weight of 10% to 15% of the total GTW. A perfectly balanced trailer is dangerous to tow.
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  #15  
Old 03-07-2022, 09:33 AM
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Aircraft the practice is to coat inside of tubes with linseed oil . Does this help on box tube trailers ?
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  #16  
Old 03-07-2022, 09:39 AM
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Quote:
Originally Posted by JBFab View Post
Capping the tube is worse. You are trapping condensation inside the tube. If you truly do seal the ends not only will you accelerate rusting, but likely cause the tube to bulge when that condensation freezes.

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I agree. Use C channel.
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  #17  
Old 03-07-2022, 07:47 PM
SuzukiSamurai SuzukiSamurai is offline
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Thanks for the replies.

It doesn't really freeze here so having tube swell from frozen condensation isn't an issue.
This discussion does have me thinking about automotive cavity wax though.
May be worthy to use a can or two before sealing...

The 10-15% tongue weight is just about right even with where I was planning on placing the axle.
Just because the axle is close to the center of the box, doesn't mean it is the center of gravity for the trailer.
This also isn't the first trailer of this kind....
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  #18  
Old 03-07-2022, 10:36 PM
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Shade Tree Welder Shade Tree Welder is offline
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I have had really good luck with this product.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Here is a nice application kit for getting inside places. I just plug it into a can of brake parts cleaner to clean it out when I am done. I keep it in a length of PVC tubing to keep everything straight.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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  #19  
Old 11-03-2022, 01:55 PM
bunkclimber bunkclimber is offline
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Default trailer build

If you go with 3" c-channel you'll have no problem at 3500# gvw/gross weight.
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  #20  
Old 11-03-2022, 04:57 PM
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Any friendly fabricators nearby with a decent sized guillotine and a brake?

If you could get some channel folded it would be the right job.

Trailer weight limits are lower at this side of the pond, so every pound is precious. almost none are made from channel or angle, they are all folded sheet.

Could you get some 4x2 3/16 channel folded up?
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