Bill, that may work well, but I'll admit to being a little skeptical. Sometimes I have a hard time visualizing the actual size from a picture, but it seems that the wheels, or castors, are a bit small for most 5th wheel RV pin weights. And if you're pushing against the dolly and one or more of the wheels finds a small hole, rough spot, etc., could you turn the dolly over and drop the front end of the trailer? Of course, if you leave the jack legs fairly close to the ground and go slow, I suppose it might be safe enough.