Well I finally did it. I got the AC off roof and the regular vent in.
Now I am not worried about going camping on below freezing days with that heavy AC unit on roof
I was at the RV store and looked at the Terbo MaxxFan and talked to one of the installers at the shop and he said that I could save some money by just going with the Maxx fan.
This unit replaces your existing roof vent.
I could have gotten this unit and be ready to go for the price of $320 + install cost.
This has a 3 speed fan and a collapsable cover over the vent.
The unit I want to put in, utilizes an existing vent and the hood is shaped like a raceing helmet with the fan faceing down behind the opening. Cost at another dealer $303 + install
This ment that needed first to install a regular vent at a cost of $ 35 + install
Total (I installed myself) $338
Plus they may buy my AC unit off of me.
Gerry - below is link to unit I am going to put on.