Working under the dash is painful in a variety of ways. To make the physical part of it somewhat easier a buddy suggested I make a “bed”. It’s fairly simple. A plywood plank wide enough to fit between the seat bottom and toe board. And long enough to rest securely inside the cab, about 1/3 to 1/2 way and protruding outside the cab about 18” or so. The outside end of the plank has legs, somewhat similar to a long folding table, fastened to it. Then add a foam rubber or similar mattress. Worked like a charm for me. I think I even took a couple short naps along the way.🤫