I reread the OP and since he has a MH I assume he meant whether to run fridge on 120 VAC via inverter (batteries) or propane while driving. On prior DP I could plug fridge into an outlet power by inverter. That would be my preferred mode given the smallish propane tank on the Seneca. Propane usage may not be a problem in warm weather but it is in cold weather.
When I a little extra time I will look into getting access to inverter outlet for fridge.
2015 Jayco Seneca 36 FK
2016 Jeep Wrangler Unlimited tow
2010 Tiffin RED 36 QSA - gone
2011 Monaco Monarch class A - gone