Check really, REALLY carefully for leaks and water damage. Just because the seller claims there's none doesn't make it so. Pay extra attention to the overcab bunk are, and the front edges & underside of its mattress.
Jim, "Do not meddle in the affairs of cats, for they are sneaky and you sleep with your mouth open."
'06 Tiger CX 'C Minus' on a Silverado 2500HD 4x4, 8.1 & Allison (aka 'Loafer's Glory')