Hi Tom,
Both redundency and creature comfort.
Just think about the entertainer industry. If one of their fleet Prevo's had only two or three roof wharts, and
one or two broke down, do you think the they can justify sending the renters another coach for an A/C problem?
The last Prevo we had at the shop in August had [2] power tech 17 KW generators onboard.. And also housed
[2] 30,000 btu home type A/C systems. That's 5 tons!
Secondly, the entertainer coaches also usually sleep 12 to 14 humans. A 12 bunk coach is very common.
Me, I have 30,000 btu's total on the house side and the factory 11 ton OTR system that works fantastic.
Nick-