You're not the first to complain about the location, hard to imagine anywhere that would have been worse. I did mine in a parking lot while on the road, I'm pretty slim and was just barely able to get in there, I don't think a big guy could do it just using the coach jacks. I had the dw standing by to pass tools as once in I only wanted to crawl out once. Thought I was being smart, took a container to poor the diesel into, then while still in the cramped quarters, moved the wrong way and poured the whole thing all over myself. Nice. Just to let you know you're not the only one.
2004 Newmar KSDP 3353