I did contact Van Specialties last summer - they quoted about $1200 for the tank and installation, bringing the plumbing into the inside of the van. They're a bit farther than I like, considering I don't know anything about their work, though. I don't want to pay someone to install the access door a little crooked, or to drill sloppy holes, or something...
GTRV have been helpful. I emailed them last summer as well - at the time, they were completely booked with full conversions, but they said to contact them again in the fall to see if they had time. I emailed them this week and will see what they say. I expect it's Christmas break for them right now, though. They'd be my first choice, if the cost wasn't too much - I've seen a bunch of their work recently and the workmanship looks very nice. I think they take great pride in their work.
Thanks for the Westy idea, Roonie - I hadn't thought of that. The price sounds in line with Van Specialities' quote. I have a Propex in the garage waiting to be installed. Was it NorthWesty? (www.kirkmeeks.com
Although the more I talk about it (and the more times I type out four-figure prices for the installation!) the more I think I could do it myself. For the cost of installation (~$1000 when you take out the cost of the tank) I could probably have my garage door header raised and get the van inside for some winter work
Any more suggestions welcomed.