Dan said it all, if you don't feel you have enough RV knowledge to evaluate a used rig, get some assistance.
We had a 2010 ElkRidge, used for recreation for 4.5 years, then fulltiming for 1.5 years.
If you are wanting a 2-3 season recreational rig, the ElkRidge is good for that. If you want it for fulltiming, I would not recommend it. It is not built for that use. The tanks are smaller, insulation is less, storage is less, smaller fridge, smaller water heater, finishes and products used inside are not meant for the rigors of constant daily use.
Area to look at: where back wall meets the roof and sidewalls, and at the bottom back corners. Some have reported water intrusion causing back wall to deteriorate at back corners of the rig.
Front overhang: look for separated caulk where sidewall meets the curve. This could be a sign of frame-flex, which could contribute to broken aluminum welds inside the walls. Heartland and Lippert have repaired a number of rigs even after warranty, but may baulk at second owner claim.
We loved our ElkRidge and enjoyed it, it was great for what we used it for. But once we began fulltiming we realized we needed a coach more suited for that. We have a Big Country now and love it.
Good luck! Hope you join the Heartland Family.
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