Tow Tuff Adjustable Trailer Dolly with Caster--fully assembled.
$100 — Mechanicsburg, Pennsylvania
Great for moving your trailer by hand on flat surfaces.
I bought this to move our 3500 GTWR in the backyard. I have a grassy slope I wanted to move it on. This is really for flat, non-grassy surfaces. I bought this new and tried using it twice. Roughly $160 new.
If I didn't do the link to my picture correctly, here's a link for the dolly at Amazon: