I would not let +/- 1 ft limit my decision, because you will always find some place you will not fit unless you buy one of the smallest class B's. It may be due to the width of the road, overhanging trees, or of course length of the pads. I know of one relatively nearby (75 mile away) national forest campground (built by the CCC in 1937) that list max length at 24 ft, could I squeeze in with my 28 ft class A, maybe, maybe not. I scouted it out when I was passing by in a car recently and it looks tight enough getting in that I don't think I want to try it.