I would say yes.
Last week our A/C went out at home. Went and got the camper from storage cave and it was a nice 68 degrees inside. set the A/C to 74 for the day. It popped 98 degrees outside, camper stayed nice 74.
However, in July we were on a Colorado trip. Set-up at night and it was about 90 degrees (104 that day in western Kansas), took forever to cool the unit down.
A second A/C when travelling would have made a big difference in the cool down period.
2013 Coachmen Freedom Express 320BHDS pulled by a 2005 F250 King Ranch CC
A rainy day camping is better than a sunny day at work.