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Unread 10-14-2013, 04:14 AM   #1
Maverickxeo
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2002 TJ Wrangler 
 
Join Date: Jan 2010
Location: Wetaskiwin, Alberta
Posts: 1,971
How to estimate trailer capacity?

A while back I had posted that I got a little cargo trailer for free, and I did do some work to it (new boards on the deck, paint, new lights, etc) but I would like to know what my axle/springs can handle.

I know the tires are only rated to 590lbs (each) and would like to get larger ones with higher capacity, but I do not want to if the axle/springs are not up to it.

The wheels are 4 lug; and the axle is a square tube axle. Ive read that if you measure the diameter of the axle, you can get a good 'guess' on the weight rating; but thats only for round axles, isnt it?

As for the leaf springs, I have NO clue how to find out what they are rated for.

I DO know for a fact that the trailer deck itself will hold a fair bit of weight (Id say its built like a 3500lbs deck), but as of now, I KNOW the tires ARE a limiting factor, and the axle/springs may be as well.

I honestly just would like to know what is safe to haul; more than what I could haul at the max (I did haul a trailer load of scrap batteries; weighing around 1100lbs... that was sketchy enough for me on those tires even though I only went about 1 km!).

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Unread 10-15-2013, 12:19 PM   #2
RowJ
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1998 TJ Wrangler 
 
Join Date: Jun 2010
Location: Texas/OK Border
Posts: 2,027
Quote:
Originally Posted by Maverickxeo View Post
... I would like to know what my axle/springs can handle.
Rule of thumb....
4 lug axles are 1000 lbs max
5 lug bolts = 3500 lb axles
6 lug bolts = 5200 lb axles
8 lug bolts = 7000 lbs

Also.....
1 3/8" axles tube diameter = 1000 lbs
2 3/8" = 3500 lbs
3" = 6-7000 lbs
3 1/2" - 8,000 lbs
etc.
Quote:
Originally Posted by Maverickxeo View Post
..... as of now, I KNOW the tires ARE a limiting factor.....
I would say if no brakes....that is the limiting factor!
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Unread 10-15-2013, 03:10 PM   #3
Indy
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Join Date: Oct 2004
Location: WY
Posts: 2,981
Your trailer is a LIGHT weight trailer, I'd say 1000 pounds max before I had serious stress about hitching it to my truck. The tires aren't the limiting factor on that one, they're rated for a smidge more than the trailer likely would be. You can go to bigger tires if you need the clearance but the weight limit on the trailer isn't going to budge.
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