Here's a spec sheet for a 1991 ORED model.
http://beamalarm.com/foretravel-link...nd-manuals.htm
There wasn't a 1990 ORED file but I think they are pretty much unchanged between 90 and 91. The transmission is acutally a 545 not a 700 series (which is used for at least 350 hp engines) and the ORED is a pusher. I can't offer any advice about the 8.2 or CAT engines.
The ORED is a middle of the road model with an Oshkosh chassis - but Foretravel builds all their coaches with the same high quality. There's a OREG. These are pretty much traditional design RV's built on a frame rail chassis but with high quality. The low end (but still very high quality) are the front engine gas models on conventional gas chassis. I think O= Oshkosh, RE=rear engine,G=gas, D=diesel.
The higher end Foretravels are the U280/U300 unihomes of that vintage. Unihomes are Foretravels own design where the sidewalls carry the weight and there are no floor beams between the axles (full monocoque). Later in 95 they introduced the Unicoach series which have the front entry bus style. When multiple slides came about (in early 2000's) the unibody contruction had to go away because of all the "holes" in the walls.
The Unibody models are known for having huge basement storage (ie. no frame rails to get in the way)
The term "Grand Villa" refers to the sloped aerodynamic front end.