need number

[spotpatch]

I'm trying to find out what my 2003 winnebabo adventurer with an 8.1 l engine would be listed as in their Fastrac FT model. I.m trying to get which fastrac number to use in my obd scanner. it keeps asking me which fastrac it is. any help would be apopreciated. My winnebago is a 38 footer. 2003 Adventurer with a 8.1L engine.

[Morich]

I might try looking under the hood as there is often an emissions label that gives lots of fine details on engine, etc.?