Hello...
We are a couple from the UK just finishing off our 8 month tour of the US and Canada...we looked at shipping our UK RV over too...most people would not insure us...
We got an offer for insurance for our British motorhome in the States from the below American company... we dealt with the manager, Ms HINES...this is a company who specialise in providing insurance to diplomats and service personnel abroad but also offered insurance to us...once they understood what a European van was...the quote was over $1300 so very expensive for 6 months - especially when you consider that we have insured our US van for $300 including breakdown and Canada for 12 months...
www.sunriseworldwide.com
A German company who will ship your motorhome out are called Seabridge - www.seabridge-tours.de - they will also insure your van but again it will be expensive...it covers the US, Canada and Mexico - if you email them they speak English and will send you a quote...
In the end we bought an RV in LA and have travelled around in that... we worked out the cost of shipping, insurance and changes we would need to make to the van for the US would mean it was cheaper to buy here, travel and sell...
Hope that assists..
Tara