Mr. Scott,
If you are even thinking of buying a used Prevost you need to join www.prevostcommunity.com. (it's free).
There are several people right now on that site that are in your shoes contemplating the same idea.
Secondly, if $150,000 is your budget, you will need to look at Prevosts in the $120,000 range as you will probably need to 'zero-out' the coach which is about $30,000 and will consist of:
-new tires
-new norgren valves
-new batteries (chassis, house, generator)
-new air bags
-oil/filter change
-transmission oil change
-chassis lube
-possible front end parts
This will put you with a very reliable bullet-proof bus. Prevosts, as you may know, have real front and rear bumpers and the shell is completely built before a conversion is made.
Some of the older Prevosts may have side panel delamination that will need to be considered in your offer. Depending on the year, Prevost has paid for the repairs which are extensive (but not for the repaint).
The price range that you are looking at will most likely get you a coach with no slides.
Just for reference, there is a beautiful 2003 Liberty Coach (non-slide) that has had ALL of the maintenance done plus more including all delam work. It has 160,000 miles on the DD engine and they are asking $259,000 located at ETLC (East Tennessee Luxury Coach) in Vonore, TN. It is a beautiful coach.
There is at least 3 yrs. of reading over at the Prevost Community to keep you busy.
Safe travels,
MM.