Camping World is like the song says..."a snowball rolling downhill, headed for hell". Their volume is so high they don't have to care. They are at every exit and too convenient. They have everything and mostly good quality merchandise in the stores. The service tech turnover is higher than pancakes at IHOP. They have huge profit quotas in their service departments and, as stated by OP they know or at least think you have no other choice. The tech's income is probably tied to a percentage of each work order. I may eat these words someday, but from all I've read over the past few years, I would never let them touch my unit! They follow these forums and it amazes me how they never address anything. I think they give out bonuses and "atta boys" to the employees that generate these irate issues. Back to the OP...there are only three companies in the U.S. that manufacture batteries and put everyone's brand name on them. Buy batteries from name brand stores based on proper application recommendations and replacement warranty.
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie