Whatever you buy, recommend it has rear bedroom with fore and aft RV queen bed with access on both sides (or),second choice, twin beds. You will probably also have convertible sofa or dinette and overhead bunk for kids. With a 30 footer you may not need slides. Our fridge, roof AC, converter/charger and two 6-volt T-105 batteries needed replacement at around 10 years old. Tires should be replaced when older than 5-6 years old regardless of appearance or tread depth. Have engine cooling system and brakes serviced as needed. Buy 3-5 years old if used and have rig inspected by pro truck mechanic and a trusted pro RV repair and get estimates for replacements or repairs including parts and labor. Read "stickies" and recent advice threads on this forum. If any smell of mold or water stains in ceiling, do not buy.