RG-58 or RG-59 cables might
be adequate for use with a standard VHF + UHF broadcast band antenna.
for Satellite and (digital) CableTV systems, we strongly recommend a high quality RG-6 Quad Shield cable.
prices for RG-6 materials at the places like Radio Shack and Best Buy tend to be exorbitant. you might do better at HD or Lowes.
or, if you encounter a local tech for the Cable or Sat TV company, you might be able to negotiate a good deal, as many (in our area, at least) are independent contractors rather than statutory employees.
prewiring HDMI cables may also be a good idea.
as to audio cables, the answer is "it depends" on what you're hooking up? the acoustics in an AS don't demand "monster" grade cables, but as with the coax cable, don't scrimp.
shopping online at Crutchfield
may be helpful.
in any case, try to grommet the holes in the trailer's metal ribs where your wiring passes through to help avoid future failure from rubbing through.