Well, when I bought my truck the Sales Manager did a brief PDI and walk thru with me. A truck is fairly simple, almost universal. All he covered was the new or different items. RV's are unigue, each manufacturer has their own way of doing things, and developing an owners manual that incorporates updates and changes in production methods is tough. You can't make a needed production change today and have that change reflected in the owners manual when it rolls out the door complete in a day or so. RV's are notorious for production changes so a walk-thru certainly helps. I do believe every switch and valve, except the obvious, needs to be labeled.