Hmm....guess it depends on how much you want to spend.....
Electrical cords and adaptors, upgraded sewer hose, tire chocks and levelers, stabilizer pads, awning rug, collapsable water jug, extra fuses, fresh water hose extension, filter and water pressure regulator, tire pressure guage.......
I'm sure others will fill in on more must haves=]
2010 Dodge Ram 1500
2012 Rockwood 2306
DH (Alan), DD (Madison) and Zoey the lab,