----- > Surly some soundproofing here and under the rear seat would be highly
> beneficial.

Under the rear mattress I have a 1/2 inch thick sheet of super-dense black foam
that heating and cooling contractors use for insulating purposes when installing
furnaces and air conditioners. I don't know what it's called but it does a good
job of sound proofing and insulating the interior from engine compartment heat.
This stuff is also available in six foot length tubes which I've used to wrap
the heater hoses under the dash to keep the interior floor area a little cooler
in summer.

Roy O.
'87 Westfalia GL
(till death us do part)