I have a 1997 / 1998 Georgie Boy pusuit 3512 SO the chassis is a 1997 ford F-53 and the coach is a GBM 1998 according to the placard in the closet in the rear bedroom. The Mtr Hm has 16 inch tires and a 460 v-8 engine. I have been trying to track down what the 3512 SO means. can anyone in the forum tell me what the SO means. I am wondering if it is Special Order. The coach has a lot of extras that a so called entry level coach does not have. It has awnings on all of the windows, rear air bags, Sleep number mattress, and one slide. I have done a lot of searching and have found only one other 1998 Georgie Boy pusuit 3512. The manual is no help because it only has specs and layout for Chev chassis and motor. Any information or help appreciated.