Actually I built this trailer in 2002 shortly before I went to kuwait It was one of the first trailers I used Solidworks to assist in my design.
the frame is made of 4x6x3/8" angle with 3" junior I beam the tongue is 4x6x3/16" rect tubing the fenders and running boards are made of 2x4x1/8" tubing and 1/8" treadplate
The bed is 20ft by 6'6" overal width at the rear is 8ft 6 in tapering from the fenders to the front to 8 ft wide
from the rear to the hitch is 28ft overall
the axles are 7,500 lb cap each with electric brakes on both axles
I recently re floored the trailer with boards saw-milled from utility poles
This trailer has been pulled all over the country in the past several years just 2 years ago I pulled it from here to southern California then up to Seattle Washington and back with close to 17,000 lbs on it,My friend while I was in Kuwait has hauled everything from a case 580 backhoe to a couple of Mack trucks on it and even a 24 ft Winnebago on it from St.Louis to Houston.
We started the Title process before I left but in all that time until just last Friday it had never been registered So now for the first time in nearly 15 years and over 150,000 miles the trailer has tags on it that are not paper permits.
I made the tool boxes between the tires to carry straps and chains
Mounted in the tongue is the battery for the winch and the brake away safety
the hitch and tongue are designed for up to 6000 lbs of tongue load I could probably put 10,000 lbs load on it but the 2 5/16" hitch would be the weak spot
I normally use load equalizer bars on my receiver hitch
THe holes cur in the tubes are for weight reduction but mostly to add signature to the trailer
I made the equalizers 20 inches longer than stock to spread the axles this was to allow weight to be more evenly distributed on the trailer
the hole in the inner fenders are for placement of special hooks for chaining a load
note the rear rub rail and pockets for chaining and tail gate kit or to hook the ramps on
also all along the sides fo the trailer there are a series of paired holes 1 is a pocket for side biards the other is for passing the hook of a 4 inch strap through