The main thing to remember is get air moving through the cooling fins. On TT's and other RV's that have a vent stack, they make a fan to pull air up the stack that is attached to the top of the stack. That or using a computer fan to blow air up the stack from the vent compartment would work well. Tyinginto the RV's 12v system is best as when it's on, the fans on. Put a switch on the fan to make sure you can turn it off when it's not needed such as in cooler weather. Makes a big difference in how fast the frig cools down to operating temp and how well it does in extreme heat.