I lived full time in an RV for several years.
One thing thing to think about is the use of fuel. If you are off grid and cooking with propane you become mindful of the amount you use. I found a pressure cooker saved fuel and time while letting me still have those cooked for hours type dishes. Lorna Sass has several really good books out on pressure cooking.
Small spaces can get really hot, steamy and smelly when cooking. I found the portable propane burners sold in Asian grocery stores to be incrediably handy. The flame held outdoors better than any camping stove I ever had. The temperature adjusts well and the entire thing takes up very little space. Set it up outside to fry fish, boil pasta water, whatever! This was also handy to use when taking a meal break while driving since the primary gas lines were turned off.
Keep lots of plastic dish pans handy. You really don't want to drain pasta or potato water into your holding tanks - the starch builds up. Much better to drain into a dishpan, let it cool down and then water the surrounding plants!