I just stopped by a local ham shop that I came across the other day from a recommendation of another Ham. CT Morgan and associates in Chattanooga (www.ctmorgan.com
I picked up a Larsen NMO mount that came with 17 feet of coax, and a Larsen NMO2/70 with the coil.
I used an antennex hole saw on the roof of my F-250 and installed the antenna about 4 inches up from the brake light on my truck. this was about the most sturdy place on the truck as I wanted the surface to be rigid, and there wasnt that many support braces.
Ran the coax under the headliner and down the drivers side rear pillar behind the plastic. The I brought the coax under the door sill next to some existing loom so as not to get pinched, then up under the drivers seat where I am going to mount the radio chassis.
I will do my radio install tomorrow, and I plan on mounting my Yaesu 8900R control head on my dash hopefully.
I love NMO mounts, they are easy to install and versatile!