How do I tell what model of RV I have?

There should be an end manufacturer's identification tag somewhere around the drivers position, with model and serial numbers, and vehicle and axle weight ratings, as this was a DOT requirement. I've found this tag in motorhomes back to the '80s. If there is a driver's door, it can be on the door or door jamb. If no door, it could be over where a door might be installed.

The model number may not be the model designation used for sales, or decorating the vehicle, but you might be able to relate the two names. E.G. my Itasca Spirit 29B (sales literature) is by manufacturer's tag a Winnebago IT329B.

Chassis model information is encoded in the chassis VIN, which by 1991 had to be a metal tag installed in one or more locations.

I don't understand why a lot of people come here first before going to the manufacturer of their rig...huh?

You may contact Fleetwood here and they will answer your question.

Richard

Don't know if this is any help at all, but here's a link to a service manual for the P-30 chassis. It was published in the early-to-mid-nineties so should cover that portion of your rig.
Service manual: P-30 Chevy

Most individual systems inside the rig have/had manuals put out by their various manufacturers, and many are accessible online by searching for specific name/model number of the component (fridge, furnace, whatever).

Not sure about the rest of the moho, but these resources ought to give some help when it comes to most of the moving parts.

I need the info for replacement parts, repairs, etc..

See if it listed in the old Kelly Blue Book. It is probably listed as a 29'. It usually doesn't mean much anyhow. If you like it it is a good model.