At 7 years old, very little, if anything, is still going to be under warranty. Appliances, A/C, furnace, etc are usually gone in 2 or 3 years, 5 if you're lucky. The roof may still be under warranty. Suggest you try to get the info on exactly what brand of warranty and give them a call. Frame and axels, maybe. You're going to be pretty much on your own.
Personal question and feel free to ignore it, what is their asking price and what are you thinking sounds good? Can you list some of the amenities and the condition they're in? Might help us to know that to see if the price is even reasonable. You may have stumbled onto a real gem. OTOH, maybe a lemon. More info will help. Good luck.