Help with new custom setup

[sdixon747]

I recently put a deposit down to have a new trailer custom built. This gives me the opportunity to optimize my shack and antenna setup. I plan on running two runs of coax to the back and two more to the roof. The roof will be basically clean, ie no air conditioners (basement air) but will have a fairly large solar array. The overall design is still being finalized, but the overall length will be between 42 and 44 feet.

So now to the big question. Ground plane? I guess that theoretically a copper plate covering the entire roof would be ideal, but very expensive and not practical. So, looking at various ground plane solutions, and weighing the cost/benefit of each, what would be best solution? Copper wire run in a radial pattern on the roof? Copper foil? Maybe put nothing up there and just use the steel of the frame? Would copper in the floor (closer to the ground) be better? What do you think?

Thanks very much for your input.

Steve
KJ4YGY