I just bought a used 2006 Keystone Hobbi 220. It is rated 1/2 ton towable. Steel chassis, aluminium body frame, fiberglass exterior. With furniture folded/moved, the whole length can be used for toys. I like this because depending on what I put in it I can adjust the tongue weight. 50 gallons water, black & grey 30 each. I paid $9K. I didn't think I could buy a used cargo trailer and convert it for that much.
Cargo capacity is about 2,600 lbs, (I get different numbers from different sites).
This is the add for it, probably won't be up for long, (I take possession tomorrow). https://www.rvtrader.com/dealers/Joh...-220-120630590