The mfg. states the front tire as 90/90/21. So 90 mm equates to 3.54”. What overall widths are most of your front tires, like if you cut a u- shape out of cardboard, or bent a stiff wire, then measured. ( unless of course you have a big set of calipers ). I’m hoping the homemade chock I made with (3.5”) wide slot will work, and hold the front tire snug, so I can stick/roll it in and it will hold the bike upright untill I get the tie downs on. I have built an adjustable width chock, but it went with the trailer I built when I sold it. It was real handy setting it snug enough to push the front tire/wheel into and it would just stand there. Just easier IMO. If the tires in general are much wider than 3.5”, I can ( but not very easily) move the sides/ends out some. Thanks for your replies.