My 23RB has the space, and electrical outlet for one, and is in fact an option. However, I don't have one, and use the space for my sewer dumping tub, and my leveling blocks, chocks and ramps.
Most of the time, I don't need it, but during football season, it would come in handy. I could get cold beverages all the time with out going inside to the big fridge.
For my use, being electric would be no problem. It'd cold and filled at home. It would stay cold during the 4.5 hour drive to Blacksburg, VA. There, we always deploy generators so it would immediately begin to maintain the coldness.
Erroll and Mary Doss and Duffy (RIP)
2017 Jayco Jay Flight 23RB
2014 F150 SC, 4x4, HD Pkg, Sterling Gray