I store my trailer at home and use a 20 amp circuit in the garage + extension cord connected to a 30amp ADAPTER
set the A/c to 85 Degrees
this stops the trailer from over heating and expanding the plastic trims
and keeps the a/c from not sitting around gathering dust ... a/c like to be run
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I had a warranty problem with my microwave and Forest River looked after it
Called the number I found on
https://forestriverinc.com/
they gave me a list of companies they work with in my area mobile techs , repair shop and dealers DID NOT have to use dealer I purchased trailer from!
First one I contacted ... would not do the work because FR would not pay enough?
FR contacted me and THEY had spoken to another mobile tech ...
(didn't know they were monitoring and that they would do that?)
offered #2 a bit more money and he came out and did the replacement
#1 Tech guy called a couple of days later and also said he was now willing to do the replacement because FR offered him more $$ ... awwww Sorry job got assigned to #2
Obviously if the issue is something like a microwave / air conditioner etc it is easy for them get fixed.
Other things like your bubble... I reckon they take the stand that it is normal for that design / build price.