It's not really that amazing. Most employees of dealers are under paid temp help of sorts. They have no skill in repairing campers and most, if not all, don't own one. Therefore, a camper mechanic who falls within those parameters has little or no skin in the game. Frankly they just don't care. There is no standard or certification I know of similar to auto mechanics ASE or even better Harley dealership mechanics.
Our dealership had no idea of the upgrade of the Dometic 300 commode last year. I have watched them and often stop them in their tracks as they are about to bugger something up. Needless to say most of us on these forums fix just about everything ourselves.
Chuck and Joanne
2014 Flagstaff Super Lite Classic 27RLWS Emerald
2013 Dodge 2500 4x4 Laramie Crew
Equal-i-zer 1200/12,000 4-point WDH