The real question is: Will this be an HF, or VHF/UHF Antenna? If HF, that is a whole different BallGame, from a VHF/UHF Antenna. VHF/UHF really needs to be on the top of the Cab, so that it is't shaded by the Cab, itself, and that helps keep the Radiation Pattern close to Omni-Directional, which in Mobile Comms is a good thing. If it is an HF Antenna then there are other considerations that take precedent. Understand that the Antenna Pattern of an HF Mobile Antenna will NOT be uniform, or even recognizable, in many cases, due to the Marginal RF Ground, available in a Mobile Installation. The Higher the Frequency of Operation, the Better the Efficiency of the Antenna, and RF Ground. Ghrit, if you are planning to use the TS-480, then you might look at mounting the Radio Portion, inside the Tool Carrier, and make a very short Antenna Lead, to whatever you decide to use as an Antenna, thru the side of the Tool Carrier, to the Antenna Mount. This allows the Internal Tuner, the Maximum flexibility, in tuning the Antenna, with the least amount of External Capacitive Coupling to the RF Ground, provided by the Carrier, Truck Bed, & Frame. You also will need to make the Hole thru the Carrier Wall at lease 1.5" in diameter, and use a Non-Conductive Material to Bring the Antenna Wire, out. If you just dill a small Hole, to do this, you get WAY TO MUCH coupling to the RF Ground and it is like taking a 2" FireHose with 50 PSI of Pressure, and putting a 1000# Weight on the Hose. Just how much water would you expect to get out the Far end? External Capacitive Coupling is the KILLER, in Mobile Antenna Systems. there is a Reason that the HF Antennas on those Hummers, pictured are sitting on 3" ThruMount Insulators.... Then you just run the Power Cables and ControlHead Cables up to the Cab, and Hook them up. Use Good Grounding between the Carrier, and the Truck Bed, and between the Truck Bed and Frame. I like to use the Braid, stripped for a section of RG-213U, Flattened, with a Bead of Solder, running the length, and then sprayed with a heavy Coating of Clear Acrylic Lacquer. Make at least TWO Bonds, One at each end of the Carrier and at least two Bonds between the Bed and the Frame. I will be building such an Installation in Momma's Toyota 4X4 Extended Cab Pickup, this next spring, to put HF Mobile in it. I have an SEA1612B AutoTuner to mount in the Bed which can feed whatever HF Antenna I can come up with. This means I can run Regular RG58A/U coax between the Radio on Tuner, and not worry about how it is router thru the Cab Wall. I am thinking of using, either the TS-450 I have, or getting a TS480 like yours. If I go the 480 route, I will mount it on the Back Wall of the Cab, along with the TM-D710A VHF/UHF Mobile, and mount both Control Heads, under the Dash on the Passenger side. Then bring #8 Power Wires from a spare Battery, mounted next to the AutoTuner, in the Bed, that is charged off the 120 Amp Alternator on the engine, thru a 150Amp Solenoid that is controlled by a switch in the Cab. No Dead Batteries for this Old Boy.....Passenger side Controls, because it IS Momma's Truck, and SHE is the Driver when we are together.... I am Comms and Navigator...