I transport our 2 rises in a 'minivan' type vehicle (vauxhall combo life), using 2 front axle clamps
Bike Fork Mount the bikes are a medium and a large, so they overlap a fair bit with the bars not clashing, the front wheels go in wheel bags (
wheel.bag TEX.22 | B&W wheel.guard L - B&W International ) I can fit a HUGE amount of camping gear in still, some can go under and around the bikes. I initially mounted the wheel clamps to a strip of ply with some 1" holes drilled for webbing coming off some cargo stays with the bikes facing back - now the whole of the back is ply and the bikes are facing front.
you do need to check you have enough height and length before investing...
oh and make sure the saddles are dropped before going in (I'm good at forgetting)