some where you have a model number for the AC unit.
that is the key. once you find that, either in the MFG records that come with the motorhome, or from the unit itself, with that most supply places should be able to get you in the right direction.
I hope that helps.
for example: if your ac unit is a :AC15000dw35 it takes a AC15000dwC cover..
Dan Asbjornsen and Patty Chatman
This was replaced this year with a brand new 2017 Toyota Tundra and a 2018 FOREST RIVER WILDWOOD HERITAGE GLEN 24RLSHL