CB RADIO NO SWR READING. PLEASE HELP

Just hooked up my Cobra 29 classic with a Firestik II 5' antennae on the side of a tool box on my dodge dakota. SO, when attempting to calibrate and check for SWR, on channel 40, my built in swr meter does not move from 1, needle maybe moves 1/2 a millimeter. Then on channel 1, I get around 1.1 - 1.2 SWR... I can calibrate to the appropriate place. I have been recieving transmissions, but there is a lot of noise; went from battery positive and a chassis ground in frame. This got rid of alternator / engine whine. I was talking to someone about 2 miles away, but they could not hear me and i could not hear them very good either. Is this a problem orrrrrr? Please help. Thank you.

 

Previously, I had a 18 AWG wire about 2 ft run from the mount to the frame rail, but now yes the mount is grounded i grinded a piece of the top of the bed and drilled a hole for the wire to ground from the toolbox mount to the bed / chassis. So if not mounting on side of toolbox is any good, where would be a better place per say? I'll post pics of setup now.

 

And i also have just checked again, and it is channel 1 that does not move and 40 does move to about 1.2-1.1..... External SWR meter for starters?

 

& also, please expand on what you mean by metal under it.... as in mounting directly into metal surface or mounted above?