Had a kangoo for 4.5 years, it's been a superb van & has only cost me the usual wear & tear/servicing costs. It owes me nothing, even if it went bang tomorrow.
As for ladders there's a real simple solution. you need to fit some brackets ( i used exhaust brackets) fit them to the roof bars so that they hold your big ladder in place, so it can't move from side to side. place your A-frame ladder on top of your big ladder & hold them both down with bungee straps. You will have to lift the A-frame off but the big ladder can be slid on & off from the back with ease. Ladder clamps are way too fussy & time consuming, this way you have your ladders on & off in no time. I've not used clamps for 4 years & go up & down the A1 too.
Tony