I have a ford ranger with a hard top. Its the super cab version so has a load bed just short of 6 ft. Had a 500 L baffled tank made by aqaueous with room to spare. So that I did not have to climb in the back to fill the tank I cut a hole in the side of the fiberglass hard top and fitted a lockable hatch door. I really like my set up now and much prefer it over my old van.