First things first, welcome aboard.
I once had a Ford Ranger with a vhf/uhf and a 10m rig tucked in there. Worked lots of Africa with just a CB antenna and 25 watts on 10m.
Since you don't seem to have much interest in operating the rig while driving, suggest what ever antenna you wind up with be mag-mounted in the middle of the Jeep roof.
Good crew on here. Some other folks will have some opinion/advise here shortly. Again welcome to ORR.net