I added a dynamat type of soundproofing to my van in the front door panels and floor.

It reduced sound slighly - but since the majority of the noise in my van is wind noise, it is not really perceptible at freeway speeds.

Todd

 -------------- Original message ----------------------
From: "Royston, Jerry" <gmr@OBPA.USDA.GOV>
> I was wondering if any of you have done any soundproofing of your van or
> camper and if so what your experience has been.  Is it worth the effort
> and expense?  What would be the least expensive material to use that
> offers good results?  It seems if you could make the van a bit quieter
> it would greatly enhance the driving pleasure.
>
> Gerry