Living in Texas we have gotten to know the ins and outs of the TT fridge all too well. Here is our little bit of friendly advice...
1.) Propane. It works. I was told this numerous times from friends and last summer we really began to use it religiously. It makes a big difference and is especially noticeable when the weather is hot outside. (See #2)
2.) Your RV fridge works by heating up gas in its system and needs to have some pretty good air movement across its coils for it to be effective. You have a grate on the side of your RV behind the fridge, and then a vent on top of the RV. Behind the Fridge, there is a little heater (when on electric) or a burner (when on propane) that runs the system. Air comes in the grate and is carried up and out the vent. If you have a lower outside temp, then electric or propane can heat up the air and move it pretty well. But, when it gets above 90°F, propane does a much better job of heating and pulling the air up through the fridge stack. Recovery time is the biggest indicator you will see of this.
3.) A fridge fan. We bought a little unit at Wal Mart that is battery operated and circulates the air inside the fridge around the cooling fins. It helps greatly.
4.) A fridge exhaust fan. If you didn't get too lost in my ramblings on #2,
then you will see that a small fan will help assist the convection that your fridge heater is producing. they are installed up at the vent, or in the grate, and push air up through the coils. They help a lot on a really warm day.
Sorry to be so long... I reccomend you try the propane first.. it only uses a very small amount of propane.