I have a one piece fiberglass front cap on my 2013 Winnebago Access 31WP (also still available on 2014 model) I do not have a leak concern for the life of this MH.
As an added benefit, although no scientific evidence, this cap is possibly more aerodynamic than my 2008 Access 31J. Nearly identical weight for both, yet 2013 (E450 w/6000 miles) gets 8-11 mpg and 2008 (E450 w/11,000 miles) got 6-9 mpg, both towing dolly with Jetta TDI.
I believe mpg is variable due to many factors such as; load, speed, fuel/oil quality, temperature/wind, elevation, tire pressure and engine condition. Hard to tell but this unit definitely has higher mpg.
