It's very common for sound galleries to be noisy.
Our newer OB trucks are relatively quiet, but not as quiet as a music studio.
Our older trucks, and basically all of the OB trucks I have worked in abroad are very noisy. (Nice exception: the Belgian Videohouse trucks)
Add to that the constant intercom (director, producer, external communication etc.)..
It's just part of the job to be able to cope with that really.
A fixed studio broadcast situation could be made fairly quiet, but in reality, most of them are not.