Try SAS. Thier alarm is pretty easy to fit and includes tilt sensor which needs to be positioned inside the van over one of the legs.
CC Insurance seems to accept these OK. fitting is pretty straightforward - the longest pasrt is threading the cables to the sensors out of sight. You need to put the control unit / keypad where it is not in line of sight from the PIR sensor (which usually goes at the front of the van) so if you have a wardrobe next to the door this is a fairly good place. The instructions with the unit are pretty good.
Look at the IDM4 system, has tilt, shock, PIR, socket connection and leg movement and has its own battery which is indipendent of the leisure battery and can last for up to 8 months and fully rechargable. Good piece of kit and easy to use.
Facebook
Twitter