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You would get most of your potential mileage gain by building a boattail on the back end, which, if designed properly, could also add a considerable amount of additional storage space (inside the boattail). Next, would be to do what you could (underpanelling, fairings, wheel well skirts, etc.) to clean up the air flows along the underside, sides, and top of the RV. A bullet nose would help, but would have much less effect than adding the boattail.
One way to quickly test what aero mods could do to improve your RV's mileage would be to note what your mileage is when drafting, as that is the mileage you could get by reducing your Cd. I've aeromodded my vehicle to the point where drafting at legal speeds provides very little improvement to my mileage, which wasn't the case when I started.
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