In my work on radio, satcom, and routers and switches, I have used a variety of computers for field programming, both in the Air Force and private sector. However, the two "go-to" computer for me are the Panasonic CF-72 (with the touch screen digitizer broken a decade ago) running Windows XP/DOS, and a newer CF-53 running Windows 10. These cover pretty much everything from Motorola Maxtrac's to Harris RPM12 for XG-100P radios. Both have suffered cracks at the hinges, the CF-72 has a solid state drive now....copied over the spinning drive a few years ago.
Before that, as mentioned by others, the Air Force went with Getac laptops, which work well. I also have an Itronics/General Dynamics GoBook VR2 running Windows7 that gets used up to Motorola CPS18(?) for APX and CPS16 for Trbo. For a while there Itronics/General Dynamics computers were all over the second hand market as the military flooded the auction sites with surplus. Panasonic seems to have the most of the market share, solid support, spare parts, and at least for me.....works after being stuffed into a backpack and taken on vehicles, vessels, and aircraft for a decade. But, I must also mention that I have two Toshiba Portege computers barely running XP/DOS that work just as well, a 3110CT and 7220, which have become lab/desk computers with their docking stations now.
The biggest issue I have ever had with radio programming computers has been keeping the IT department away from them. Panasonic or the Motorola MW900 computers were easy for them, once trained, to realize they did not get updated software, BIOS, connected to the Internet (except when authenticating Motorola EID's), or any other molestation IT often does to a computer in a corporate/office environment. They see a Panasonic, and know to stay away. So, I continue to buy and use Panasonic for that reason, but only every ten years or so.
Good luck on your search.