I rented a 2020 Yamaha Kodiak 700 last year for my elk hunt and it fit with the tailgate closed in a 6.5' bed of my 06 Chevy Silverado 2500HD. You couldn't fit much else in there, but the bike fit between the fender wells.
Any atv and the 50” Utv’s will fit between the wheel wells of any full size pickup. The length is the issue.