I’ve bought a Reversing Sensor set from Dolphin for my Chausson 640 (to go with the factory fit Reversing camera). I’ve fitted these type of sensors many times to cars and there’s normally been good access to the back of the bumper area to fit the sensors and wiring. On my MH the plastic bumper comes down and meets the flooring underside with a tiny gap with just about no access to get a hand in between to install the sensors and wiring. Any top-tips on how the do this? Am I missing something - or is it just going to be a pain to install?