Do it yourself Oil Change on Newmar class a gas motorhome

Here is the latest. First I appreciate all the responses. Second I can get under from the drivers side on a creeper very easy. But I still can't find the oil filler place under the hood. I sort of remember seeing the dealer once messing from the ver ver very top of the open hood in front of the drivers seat but I still do not see a filler cap. I will call Newmar on Monday unless one of you can tell exactly hoow to find it. I do thank everyone.