Here's my writeup of retrofitting a GM Vapor Canister on my 2000 Eurovan Winnebago camper:
So far, it's working great, but I've only put about 100 miles on the van.
I'm happy to answer questions here on the mailing list
I'm curious if this would work with the Weekender or MV versions of the Eurovan: Those vans are shorter than the Winnebago camper, but they also have fewer parts (propane tank, gray water...) under the body.