No time or desire to put something together yourself?
The drop trailer on the Road Ranger started life as the frame and brake axle from a pop-up camper. The pop-up part was gone when I bought it for $200. I beefed up the frame a little bit and made it a double axle which I moved to the back, and I’ve hauled over 6000 pounds with it although I wouldn’t recommend doing it often. If I had a need to do so, that wouldn’t have taken much more work when I was doing it.
Around here, you can pick up used double axle mobile home frames with 3500 pound brake axles for less than $1000, all the time. You can pick up 20 foot travel trailer frames with two axles, at least one with brakes, for under $500. The travel trailer frames are lighter duty, but they’re easily modified, and the major part of the work is already done. It’s easy to find the travel trailer frames with a title. Sometimes that’s harder to do with the mobile home frames.
From there, you can frame it in and put an Aluminum skin on it for not too much money, then you can brace it or thicken the roof or whatever for not too much money more.
As you know, I could go on and on, but you get the idea. Would you consider doing something like that? It takes you more time, but you’re probably talking about having 1000 or $1500 in total. If you focused on it, it’s probably a tour a project total.
And, afterthought, you could buy the stuff and hire some labor to build it if you know how to do that kind of thing.
My two cents, hope it helps