Don't be embarrassed. The oil filler was discussed in a post:
https://www.thorforums.com/forums/f8/...-axis-884.html
and oil changes discussed here:
https://www.thorforums.com/forums/f8/...ange-1123.html
The engine in an Axis/Vegas is the 2 valve Ford V-10. I haven't looked in the instruction book that came with the camper--in fact I don't think I've opened it more than once.
The user bevedfelker put together a really nice owner's manual for Axis/Vegas units--send him a private message and he will send you the document.