Yes. A big one:
To help you decide on what RV to buy you could go to www.rvknowhow.com and read Joe and Vicki’s suggestions and/or download their e-book `RV Buyers Homework’, which walks you through the process of choosing the best RV for your needs, selecting the right floor plans and features, determining the RV’s cargo-carrying and towing capacities and evaluating its livability. (Nov-Dec Highways, pg. 21)
RVtravel.com and the Better Business Bureau have a DVD that covers the same subject
(http://rvbookstore.com/shop/detail.aspx?p=710&m=2) and Chuck Woodbury has an ebook with similar advice that can be instantly downloaded from www.rvbookstore.com.