All the same applies to older Travel Trailers (TT)
I have a 30 year old TT that has been USED and loved and I keep her running down the road at least once a month (only got her in March this year)
My search brought out a lot of trailers, most had been sitting for years.... but the adds all said, towes great, all parts work... then you go and see them and ask, when is the last time it has been moved... oh, 2 years we had it out camping...
..... very frustrating....
My favorites are "worked fine last time we used it and running when we parked it".
My favorite- worked last time we used it or ran when we parked it.