AC On or Off During Summer Absence?

We are brand new Bighorn owners with our unit parked in an RV resort in hot hot Phoenix--100+ temperature highs all summer. When we leave the unit for 1-2 weeks at a time, should we leave the AC on to reduce heat buildup inside the trailer? What's the greater risk--heat damage to inside materials, or AC failure due to continuous use. (We have experimented with setting the AC at 90, and suppose that it runs all day, turning off sometime at night for a few hours.) Any thoughts/experneices will be appreciated. Thanks.

If you don't mind paying for the electricity, leaving the a/c on won't hurt a thing unless it freezes up for some reason. Under normal circumstances, this should not happen unless there is a malfunction of the sensor on the coil. OR If you have fantastic vent covers on any of the vents, you could just leave the vents open with the a/c off. The heat will escape through the roof vents.