I hope this hasn't been covered already, if so I apologize...Trying to narrow down the value of add-ons, in looking for a Sunrader I'm not finding any with generators. Did any get built with a generator? If so, what is a figure I should use for the value of a generator on a Sunrader? Is a generator really worth it (used a lot), if so can I get a portable that's worthwhile or should I try to get one built into the RV? Thanks!