I have been needing a vise for the truck and went looking at Bumper vise's.
I ended not getting a bumper vise and instead went with a Ridgid 425
(tristand/chainvise). I gotta say I'm impressed with it's light weight and portability. I think this little tristand is just what I need for residential gas lines and copper Sweating / Brazing
My pictures turned out crappy so here is a link: http://www.ridgid.com/Tools/Portable-Tristand-Vises