First off, you don't want the tap on the grill, the heat the grill puts off and a tap system DO NOT MIX! Now, the CO2 is used for two things, one, it provides the pressure to make the beer flow from the keg, and two it maintains the CO2 volume in the beer(this is where them bubbles come from). Sounds like the best solution for your customer would be the MicroMatic Party Cart. That way they can move the keg around to a good spot AND keep it away from the keat of the grill (can't stress this enough). And, unless they like warm beer, it would be very costly to mount a keg in a truck bed and run a line any distance from it, this is because you need to keep the beer line from the keg to the faucet chilled just like you do the keg or you will have foam problems and warm beer, neither of which are cost effective or good to drink. Where are you located? If it is somewhere close to my area I wouldn't mind sittin down with you and helping plan it out, sounds like a fun project.
Semper Fi,
The Gunns
"Beer is proof that god loves us and wants us to be happy" - Benjamin Franklin
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