at the risk of puttin a downer on it ive had one for 2years only used it a few times they can some times be tempremantal ok if you do a lot of connies .if its that cold you could run risk of cracking glass how many realy mining jobs do you get, i got one just because it seemd like every one else got one. then theires insurance to inform etc to me its just another avoidable expence imo, do you whant to cut a hole in your van roof