HIs complaint is not with Tiffin I think but with the dealer.... The Dealer should have requested the not all that inexpensive service manuals with the new unit..
Suggestion to the O/P.. If you continue to have problems Contact Tiffin direct, Bypass the dealer.. You might be very surprised at who comes out to make it right..... So will the dealer....
A short but true story of another company.
MY RV (Chasss maker) Issued a recall. Since my dealer did NOT register the unit with the maker as they promised they would I did not get the letter with the replacement part.. instead I contacted the company and got an E-mail.
So I went to the authorized service center and said "I'd like to bring it in in 2 weeks, get the oil changed, a lube job and do the recall" they told me they could not get the part that fast (Standard Chevy Part, the recall was actually from Chevy/GMC and they were a dealer so they had the part).
I said "Schedule the work I'll get the part"
Called Workhorse talked to a man who's card I still have even though he's no longer there.
Two weeks later I handed them the part..... ASttached to his business card.
Nothing was said but the job was done
Well..... Then it was time for another warranty job
THey found the part and had it FED-EXed overnight.
Oh. The card.... Workhorse National Customer Service manager.. The man who decides **IF** they are an authorised service center or not.