Mine do not, 4 step, slightly lower than campers rear bumper but not near hitch (extended) to cause interference. But really couldn't say on different combinations, however easy enough to pull pivot pins or locks to remove if needed when towing. Steps wouldn't be able to fold down anyway, unless trailer parked at quite an angle.

Yes, its a Torklift lock, I had ordered a set of 4 so the pivot and added 'safety' locks are keyed alike. Drilling is actually thru 3 arms to restrain. Simply didn't like relying on rubber snubbers to keep folded. Note middle arms are at an angle in relation to inner & outer when folded, so hole must be off center to catch. see 0:54-:55, vertical arm at right boot. You can see my first hole was off edge, had to swap inner & outer arms and try again. Bolted short piece of al bar to lock pin head as handle to insert thru - couldn't get my hands between treads.