hit up your favorite search engine and search for "radio enclosure" or "mobile radio enclosure" and you'll get some good hits.

For example: https://duckduckgo.com/?q=radio+enclosures+for+mobile+setup&t=brave&ia=web

Some options from the results include:

https://www.psicompany.com/radio-racks/

https://powerwerx.com/mblcovr-mobile-radio-base-station-enclosure

You could also look at something like this: https://www.amazon.com/WORKMAN-DXX-RADIO-MOUNTING-BRACKET/dp/B00SJSEUEM/ref=sr_1_1?keywords=WORKMAN+DXX+CB+RADIO+MOUNTING+BRACKET&sr=8-1

Lot's of DIY options out there too depending upon your skills and tools.