In finishing our build sheet we loaded it up pretty good saying better to have and not need than need and not have. One thing we didn't plan on getting but threw in at the last minute was the stereo. The favorable exchange rate allowed for a few extras. We protect our electronics at home with a surge protector so I would do it on the road also. As others have said, the storage box is a must. Plus it does double duty and acts as a rock shield. What we didn't get was the 3 burner stove, oven, screen room, additional front window, and custom formica and fabric. We were very happy with the colors ETI has standard. Just remember, the build sheet will be due sooner than you think. Loren