A moderator may want to relocate this thread to the general motorhome section as it appears the coach in question is not built on a Ford Transit chassis.
If you have no owner’s manual, and your chassis is a Ford, you can attempt to obtain a manual from Ford. You could try here as a start: https://www.ford.com/support/owner-manuals/
If the owner’s manual can’t be found there, look for a similar page for the commercial vehicles segment.
If you just bought the RV new, you should be talking to the dealer about receiving a manual.