Electric travel trailer dolly

[fast60eddie]

Is there one brand that outshines them all? I am a little more than 6% grade and will have to cross a small patch of turf.
Fast60eddie

[elkinrutdrivemenuts]

In my experience with them, you need a solid surface to operate them on.  I returned mine, it did not work well/ at all on gravel.

[Zardoz]

Darn, darn, darn..

[GWP]

A runaway TT, or anything for that matter, is a scary thing. Even a 6*, you will not be able to stop it with any dolly if it decides to go a different direction. Those are primarily made for moving on a level hard surface.
Money better spent, IMHO, would be to put a hitch on the front of your vehicle, if that option will work to do what you want to do.
I have one on both our SUV's. Don't use them often, but they work well for tight spots and hauling MC's.

[Magnum_Willys]

Even the one with tracks doesn’t get good reviews off level pavement. 
Problem is you have a 500# set of tires trying to move a 5000# set of tires.   Anything other then hard level ground physics is against you.   Hitch on front or rear of a tractor would be handy.