There are some good general videos about how to change the oil in your generator. They're not bad.
But, as you point out, the generator is tucked up in the middle of the rig. You have to crawl under there. No easy solution. I always wear old clothes cause I get covered with oil running down my arms. (I'm getting better. But not a total success yet.)
The only tip I have - invest in a cheap pump with a hose that is long enough to go from the oil container up to the generator. I tried to find a way to pour it in, but it was so tight I could not tip it. I got more oil on me and my cardboard mat than I got in the generator.
Good luck. I wish they had put it along one side or the other. But then, I'm happy they did not take away the limited storage with a generator.
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