The Toad comes standard with 15" wheels and E series 225 ST tires. Optionally they can come with 16" wheels and steel fenders.
Backing up is not an issue. If you have to back into a space, you drop two pins on the Toad that locks it straight. Then the only pivoting point is the trailer coupler. The Toad adds 30" of length. When at a park, I'd unhitch the trailer and leave the Toad hooked to my truck. Driving around town with it you don't even know its there.
Here is a pic of the drop down pins for backing. They have red handles.