Dolmen brokers will insure it for you on their group scheme with AXA.You will need to send in photos of the van on all sides and inside plus of any gas connections. It will need to be your second vehicle. Good points are it's fully comp and not limited mileage and should be €300 -€350 (theres a new business surcharge so that'll go down next year. Ring them on 01 8672121.
If you're looking for a cheap camper thats also a classic there's a commer in the buy and sell for €1500 under classics. Oh and if you find a cheap LPG water heater and shower bits let me know as I'd like to add a shower to mine. Mines a '79 chevy G30 (like a camper version of the A team van). Good luck and happy camping