The Roman engineers were the first to incorporate a 1/4" per foot slope rate to help shed rain or volunteer water (overflowing creeks) from roads, roofs, drainage, water pipes, and/or channels. Rule of thumb still used to this day. Even though an RV has a slightly domed roof in most cases, this is still sort of necessary (in my limited experience living full time in two different Class A's) and most of us slope down at the front a bit anyway to help to help shed water quickly. If it's raining a lot, might even jog the jacks so it's tilted more to one side or the other to try to hide large exposures with potential gaps in the caulking like the big windows on one side or the other. Depending on wind.
Using the rule of thumb, a 36' RV would have a 9" slope back to front, if it were a road. I think you're good with a 3" slope. BTW, newer RV refers would be fine with a 3" slope.
One other thing, with a Winnie Class A, those running lights over the window are potential leak spots so wouldn't hurt to caulk around them. I use clear Silicone. Then the front windows...wouldn't hurt to have stick on gutters over them.
Yes, I do have too much time on my hands.
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