You'll want to cover any window that may be exposed to direct sunlight ; on the inside with water heater insulation ( looks like bubble wrap with one side aluminum foil ) .Comes in 3' wide at hardware stores, they cut to the length you want.
Place zip lock bags , 1/2 full of water , over every sink drain , don't use the regular stopper at the rubber may stick and tear requiring they be replaced .
Place about five , gallon jugs of water in the sinks and shower ( empty milk work fine ) with the caps drilled about 10 times with a small drill bit. you want a LITTLE humidity inside the RV , too much and you'll warp wood and peal wall paper .
Dry the fridge interior , and fill with crumpled newspaper ,lube the door seals , and close the doors.
Open fridge doors can warp in the heat.
Close off all vents with foil tape , back of fridge , microwave etc.
Tape pieces of the W/H insulation , across roof vents and shower skylight.
Cover tires .
Disconnect battery cables .
I'm sure other members will be along to add to the list.
EDIT: BTW ask your neighbors ( if there are any left in Yuma this late in the season ) what they do too.
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