Well, the first thing to do is check the tires. Especially if it sat a lot. In general, most people advise that tires be switched out in the 5-7 year period. They may look fine, but be ready to die. And it can be an ugly death - requiring lots of RV repair.

I have to agree with Jack on the tire question. If the tires on the 5er are original equipment, I would first off go get me a new set of tires. Brand choice? That is yours to make. However, I would do a lot of research in that area. Some people would not have any thing but Goodyear, others consider them trash. Carlisle, same thing. Anything made in China is suspect in the RVing area. Personally, I have been happy with Michelin XPS Ribs for over 4 years. I may change them out before going to Oregon this summer.
As far as the Jayco, if you are not experienced in RVs, I would seriously consider having a certified RV tech give it a look. Might cost you a few bucks, but it could save you a bunch. There are recalls out on a few of the components, that should be addressed. Check into that.
Good luck and welcome to the friendliest site on the 'net.

Thanks to all of you that took the time to reply. We"llbe taking you advice and by the way we purchased it today. It was too good to pass up. The unit was in excellent condition.........Hope to be out there with you great folks soon.

Thanks , Mike and Karen

I have always liked the Jayco Designer series and sounds like your's is in good shape and should be a good unit for you for years to come.

I agree that the tires are one big concern if they are original, one other thing to do is have the wheel bearings packed just in case they have not been done in awhile. I take mine apart and do them every other year and also give them a shot of grease through the bearing buddies (if your's is equipped with these) on the year between re-packing.

Good luck and enjoy your 5th wheel!

Phil and Rudee