I pull a 5er and my cat rides in the 5er unrestrained. She has access to her favorite hidey hole, litter and food. In your case, I might consider a divider just behind your chairs so the cat can't get underfoot and interfere with driving. Otherwise, they seem to manage well in a moving vehicle.
Joe, Mary and Dakota, the wacko cat
Fulltiming since 2006
2006 Dodge 3500 QC CTD SRW Jacobs Exhaust brake
2017 Open Range 3X388RKS, side porch