I don't think it will make any difference while traveling though if they are heavier, they could make the slide grunt a little more while being retracted.
We took out our two Flex Steel recliners and gave them away because they were too short of a fit for both the head and the legs. We met up with a friend last year at the NHRA drags in Las Vegas. He liked them, so out they went into his MH. We still haven't found taller units that we want to replace them with.
Bill
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.