We have a similar 5er, a 2004 Designer 29 RLTS, bought used, and love it. We also have the pantry, fridge, and stove in the same slide, and it has given no problems whatsoever so far. I believe your model has three slides, like ours. One of ours (dinette/couch) sometimes makes a little noise as it travels, but functions perfectly. If you have the factory-supplied roof ladder, you should be able to walk anywhere on the roof to check for soft spots, loose caulking, rips & tears, etc. Unless damaged, it should be fine. Recommend you inspect the caulking carefully, and replace if any looks loose. Also check the four bolts holding the A/C unit to the roof (access is under the cooling grille inside the unit directly under the A/C unit). They sometimes work loose, although ours have not done so, so far. As for tires, I would check the date codes, and replace if over 5 years old, no matter how good the tires look. IMO, Maxxis is a good brand, and GY Marathons are junk and a safety hazard. In summary, really the only thing I don't like about ours is that some of the exterior graphics are starting to peel, but that is to be expected for a unit stored outside for 9 years. If your unit has been taken good care of, I believe you will be happy with it. JMHO>
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.