I just had to pick up some rock and was weighed before and after. Before I was at 8020 before the rock and 12040 after. This is with a stock 03 F250 with no trailer and two life sized people.

 

How does F250 handle with 4000lb load? I got spoil with my F450 dually where I had more than 10k on several occasions and am trying to figure out my "new" F250. Rear tires gives the axle about 5200 lb capacity. Not good prediction in my books.

 

Here is a good site regarding how to calculate your weights and how to use CAT scales.
Towing Weight Calculators - How to Weigh Your RV - Answered

 

kd0axs - My trailer I am sure is built way over 3500#. Its mainly 3"x4"x1/4" angle, with some 3x3x1/4 on the less critical pieces, and 2by decking. It weighs 1400# empty. I bought it from the guy who built it, the plans I think he said called for 2x2 angle for 3500#, not sure why he went so much heavier but still only put a 3500# axle on it. I think I could put a 5,000# axle under it, but I am still limited by 6x10 size and with new wheels and tires and some metal or something to build taller sides I might as well get a bigger trailer. If I do go bigger I want to be able to haul a car, truck, or tractor on it though. I've seen that craigslist ad you linked and its tempting. But looks like only 3500# axles, which is almost always all I find. If I am going to go 16' or so, I'd really like something more like 10,000gvwr. But that one you linked is tempting. Not as pretty but this is one of the few >7000# trailers I have found locally: Tri Axle Equipment Trailer Thats a lot of tires to replace though lol.

 

Honestly not all that bad but it did need some extra room when stopping and corners it did feel rearend heavy but it never bottomed out. It was on the overload springs for sure but it tracked strait and I was able to do any speed without feeling like the engine was being overworked.

This is both my first Ford and my first diesel and I was impressed.