Cindy, make sure your generator has the capacity to run the AC unit you select. Sometimes, those power outputs can be a bit misleading. When an AC kicks on it uses surge power which is greater than the power it uses during normal operation. Otherwise, since I see that like me you live in a hot part of the country, the larger the unit the better.
Enjoy your Roadtrek 170. I almost bought one back in the nineties and still think they are really neat and practical. Roadtrek put a lot of thought into the 170 back then and there aren't too many Bs on the smaller chassis which is a market that has always appealed to me because how much easier it is to park, maneuver and drive.