15-17 inch wheel works the best. This one is 16. I like knobby tires for traction and grip when braking and sidehilling. 18 & 19 will work but are too tall I feel. Lots of tricks and measurements I can pass along later if anyone wants them. Just had shoulder surgery so not typing too well yet.
Cheap motorcycle grips are awesome. 3-tow straps to secure the critter, fast, strong, and simple to work with , will not loosen up. 3-4 bungie cords to secure the legs, neck/head, and packs on top if you want. Don't use rope. Does not work worth a carp when cold and frozen, or wet. Hard to get loose sometimes too! Pain in the arse!