If you're going to put a smoke system in an RV, do it like the pros. Install external hydraulic quick connects so there is never a need to pour or otherwise dispense oil inside the airplane.
Recently built smoke into a Rans S-7, with a cylindrical tank buried behind the baggage bin. There is no need to access it, other than at annual inspection.
Testing new system soon. Curious what technique is used to prevent spilling oil everywhere........