AC on winnebago vista 27pe or sunstar

I will give you my opinion based on 43 years(1979 to current) experience as a RV technician. I have worked for a dealership that sells and services the Motorhomes. Even as far back as 1984, the dealership determined that ANY RV or motorhome 27 foot or longer required 2 AC units. Even tho in the past 25 years they now have ducted AC units, did not make a difference. I have worked that time if the DFW Texas area. So, we DO get hot temps. If being very comfortable in hot temps, do not settle for 1 AC, you will be disappointed. Add in that most Motorhomes have slides now, that increases the amount on interior area to be cooled. As a Dealership, we option 2 AC units on every RV we order over 27 foot. In the old days, you had to run the Genset to run the 2nd AC OR add a 2nd 30 amp power cord dedicated to the rear AC unit, when 30 amp was the only power available. So, if your unit you are looking at has 50 amp service, good. If not, some OEM's install a Power Share control to run 2 AC's on 30 amp service. Doug