thanks. The website shows a lot of mil spec ratings but didn’t specifically say anything about water resistance.
The mil-spec ratings on their own don't mean much unless you know how they score on each category. A lot of the ham manufacturers will claim the Mil-Spec 810 ratings, but they don't always explain how they score.
As for which ones are remote head capable, that's probably a long list. For this kind of stuff, a Motorola CDM, a Kenwood TK-x180, and probably a few others would be good candidates.
The CDM's are pretty cheap on line, I've bought several CDM-750 (4 channel) for $50-$75. The higher channel counts with LCD display (CDM-1250 or CDM-1550) can run from $100 to $200. Remote head kits can be bought new for $80 or so.
Kenwood TK-x180's are a bit more pricey, but you can add the KRK-10 remote head kit and do what you want. The heads on the TK-x180's are smaller than the CDM's.