Of the three Harbor Freight Frames avalible, the 1800 LB, 1175 LB, and the 990 L. All 3 will carry anything you want within reason. It all comes down to the quesition; what size wheels do I want? If you don't care about looks and only want functionality..Save your money, and get the 990 LB'er. On my production model, "Bare Bones"
http://www.geocities.com/len19070/Bare_ ... ilers.html
I use the 1175 LB with 12 inch wheels and thats fine. On my personal trailer, i used a 990 LB. But, i put a 2000 LB axel on it. Why didn't i just build a new frame? Because of that little piece of paper (certificate of origin) that comes with an HF frame, in PA thats worth $100.
I think the real deal is the 1800 LB frame. It comes with 5 lug X 4.5 hubs. This alows you to put any type of tire you want on it. Nothing looks sharper then a teardrop with big fat wheels and fenders

. Also, big tires don't spin as much, saving wear and tear on your running gear. I have not yet been able to find 5 lug X 4.5 hubs for either 1175 LB or 990 LB. I am an RV technition by trade and i have tried this many times, to no avail. There axel spindels are real ODD BALLS. Good friends of mine that know what their doing have tried to match larger 4 lug tires to these HF hubs several times, once again, to no avail (Backspacing is the problem) "they all work on paper unitl you try them"
So, by the time you buy the 1800 LB frame, dump the stock wheels & tires on Ebay, the 1800 LB frame is only going to be about $75 more than the 1175LB'er
My vote is the 1800 LB frame.
Happy Trails
Len
AKA Dr. RV