.. check out the ones used on rescue vehicles/firetrucks (can be pricey) .. fair warning though, they are not insulated nor weather-proof/water tight in most cases .. not sure if other commercial units are either .. good thoughts though ..
Chance favors the prepared mind. - L Pasteur
Luck is the residue of good planning. - B. Rickey
Travel is fatal to prejudice, bigotry, and narrow-mindedness ... - M. Twain