I sometimes like to leave the van running with the dog inside when I'm shopping or doing something. (my PM is WELL insulated. I do this all the time in my Chrysler Minivan ....but now I just discovered that in my PM ..I can't do it .... can't lock the doors with the engine running...which is a real problem. Does anybody know if there is a workaround for this ?? I really need to leave the AC / Heat on and lock the doggie in side. Help !