My CoH1 memory is quite foggy, but I'm quite positive they had just 1 ATG, just like any other faction(except PE who had no ATG at all).
Airborn ATgun was a different version than Stock one. Anyway, with the actual USF design, the only solution is to give USF another hard AT dealer or to fight mediums or to fight heavy. Relic fucked it up with their design when they re-do Sherman model, a solution like in Coh1 to upgrade basic sherman would have solve us a lot of headache.
Imo my Solution still stand:
Swap Sherman M4A3 with Ez8 as stock. Ez8 become the superior stock medium tank in game and at the same time re-do the Jackson: increase reload time so it is dedicated to counter Panthers and bigger cats.
It would perfectly fit the current faction design:
Ostheer has Stug in T3 as stop gap vs the Ez8 (can be use in pair)or have better reason to rush a panther. And also still have Pzshrek as good option since the Ez8 has less AI.
OKW has the Panther and Jpz4 which are already natural counter to the Ez8
USF lose a stock IA tank so less pressure on Axis Faction early on, Ez8 could use a bit of buff on AI but nothing close to the M4A3. Ez4 also comes later since it cost more.
Scott would have a real role as AI dedicated late game unit (maybe give him a coaxial HMG).
M4A3 into Rifle Company also fit the commander vision as it is a infantry support tank. Price could be adjusted accordingly.