Roof top box, with some special considerations.  You'll want to drill extra
holes for ventilation, but size and place them carefully to avoid
turbulence or ingress of inclement weather.  Have a cushy bed in one corner
for him to curl into and snooze, and carpet the rest so he can roam and
pace with sure footing.  Provide an assortment of small toys so that some
of the roaming is somewhat less mindless. Spill-proof water device of
course and availability of dry food.  Litter box in a corner farthest from
the bed.

The space between the bottom of the box and top of van will provide a good
measure of sound deadening, but you should probably check out your sound
system to be sure the volume can be raised sufficiently if necessary.

On Mon, Feb 15, 2016 at 4:12 PM, Dennis Jowell <dennisjowell@gmail.com>
wrote:

> Has anyone  been able to figure out how to travel with a large 20 lb. male
> Maine Coon cat in a Westy? We are planning a trip up the Alaskan highway in
> the spring before haying starts. I think the trip will take at least 6
> weeks from Vermont and don't want to leave our cat with someone for that
> length of time. One thought was to buy a big Sprinter ($$$ ouch!) that
> doesn't seem very practical. lol
> Any ideas from the list would be great
>
> Dennis Jowell
> Scotch Hollow Farm
> Newbury, Vermont
>