We currently on a 2005 Newmar Scottsdale. It is a very nice coach, but as one other poster said, we've had more than our fair share of problems with the Workhorse Chassis. In any event, a couple of things you will want to look for, and if not there, have done.
Make sure the newest Workhorse engine breather snorkel kit has been added. This is an add-on kit to keep water from getting into the breather and engine. If mounted correctly, the snorkel or exented breather will keep water from coming up from the right front wheel when driving in the rain. It's a big deal and a real pain if you don't have it. We got ours on warranty, but I suspect it's not too expensive if you have to buy one.
Secondly, we had problems with the back two engine spark plugs burning out much sooner than the others. They were getting too hot and were not getting proper ventilation being on the back of the engine. There is an add on kit with two air scoops that hook to the front grill and through a hose that is routed two each of the two back plugs thereby blowing air on them. If you don't travel very far in your coach, you may not have the problem, but we occasionally take some long driving trips and that enhances the need for this ventilation kit.
We've had several other little problems, but all in all we are happy with the coach. The interior is one of the nicest we found on that style and type of coach. It drives better than many cars. Just be sure to follow your maintanence requirements and you'll love it.
2005 Newmar Scottdale