Fleetwood is not the only manufacturer to put the oil filler tube in that awkward spot, high on the firewall.
Necessity is the mother of invention -- I added a 4 foot length of garden hose to a funnel. I can hang the funnel on the open engine compartment door allowing me two hands to pour the oil in. (I buy my oil in large format gallon jugs when it's on sale) It is a slow fill and I have to use a step stool as the funnel is about six feet in the air, but I have a routine that works and is drip free.
If we are talking about access to perform your own maintenance then I want to add the terrible location of the oil pan drain plug. Mine is right above the front axle meaning I have to balance the waste oil tray on the axle while draining the old oil.
I always manage to spill a cup or so on my driveway every year. I do place a tarp under the engine to prevent a mess but what a pain!
