Peddler has some great recommendations.
We have a 04 Adventurer. The 35U is a great floor plan on a great chassis.
Workhorse had some brake recalls for calipers. Make sure the recall is complete before taking delivery. As far as the 8.1 reliability. Take a look around the board here, have there been some failures? Sure, I bet every engine manufacturers have had failures. Heck I had 08 Ford F-150 with a transmission failure at 30K miles.
See if they have maintenance records for the chassis as well as any of the systems.
Is this from a private seller or dealer? If dealer what kind of warrenty are they offering?
Start everything up, take it for a 30 mile ride, turn on the generator, AC, heat, microwave, oven, TV. Spend some time looking at everything. Do yo have someone that is familiar with RV's to go with you and look at it? Hire a mobile RV technicion to look it over.
Gene & Ginger
1997 Jayco Eagle 8
04 Winnebago Adventurer 33V, 05 Jayco 23B, 02 Coleman Cheyenne