Everyone uses their RV's different. What works for one person will not work for someone else. RV's are also confining. They have only so much available "space". When selecting the items to stock your camper with, you have to think smart and practical, and use items that have multi purpose function, instead of specialized items. Household appliances, like blenders, ice-cream makers, bread machines, stuff like that are nothing but space hoggers. Leave them home. Think "simple" and "basic". In fact, if you can get away from electric "gadgets" all together, it's really in your best interest.
Your camping style also dictates what items you bring with you too. Are you cooking over an open fire only? or using the Microwave only? or stove top only? Or bringing along an electric skillet or a flat electric griddle? or a gas grill? This will drive what you need.
Are you planning on using the RV on-board bathroom, or "natures way....the closes tree you can get behind", or bath houses, or something else. This also drives what items you need to bring along.
Basically, what I'm saying is, you need to determine what kind of camping you are wanting to do? Electric hook up only? Full hook ups? No hook ups? WallMart camping, RV Resort visits? All this drives what you bring along.
And the "bring along" items will change every trip. Take just what you need for the current trip, and next trip customize what you need for it.
Over time, you'll finally figure out what you REALLY need and leave behind what you don't. (There are no right or wrong's here. It's all dependent upon YOUR lifestyle.)
About motion sickness. Prilosec works great for motion sickness. Take it about 12 hours before heading out and then take it every 24 hours until the trip is over. Works great on ocean cruises also, and before having surgery! Really!
About the stability of your RV. I can't address that. All I can suggest is, take it for a test drive and inspect it thoroughly. If it does not feel right, don't get it. Usually your first-initial gut-impulse is the correct one. Then folks talk themselves out of it and regret purchasing later on.
Fuel efficiency is something you simply need to forget out! No RV is fuel "efficient". Even towable campers kill fuel mileage for the tow vehicle. This is one thing you CANNOT fret over. You either pay for fuel, or you let the camper sit, or don't purchase it at all if you think you can't afford the fuel.
But, aside from all my skepticism I've address above, I think your selection of a camper is pretty good. For all the reasons you pointed out above, it's a good choice (for you). I think once you get over your initial concerns and doubts, you'll really enjoy it. (And the price is very reasonable in my opinion).