One very minor or major difference, depending on your likes and dislikes, is that to a radio, A fiberglass wall simply is not there, An aluminum one is very there
So when I mounted my ham radio transmitter, I hung an antenna outside the rig (for safety reasons) this is a fifty watt VHF rig
But the CB (5 watt HF rig) has it's antenna INSIDE the fiberglass rig, (Same as on my all plastic car)
SWR is 1.0 to 1 by the way (Perfect) on the MH (not quite so good on the car, but still, has not changed in 10 years)
This also affects portable radios (AM/FM) GMRS or FRS radios, Portable TV's and the like, All work BETTER inside a Fiberglass house