Well it is still too fragile, and USF does not have power full support units like Schreked Pzgrens or Volks, so a good rush will finish it off easily. they also can not spam mines like other factions. But they can increase its cost a bit if that turns out to be a major problem, remember that it is supposed to be their late game AT counter. I would love to see Option one.
right, and i don't think the durability can be changed without a large cost increase or a massive nerf to the offensive abilities. i don't think it necessarily needs to be changed either; the jackson can just be a fragile unit as long as it has some advantage (range) that it can leverage.
while US does have problems with getting rushed you can mitigate that some by building tank traps. the jackson doesn't really need to be tough for the ranges it operates at, but it does need to be able to be supported enough that such a rush can bleed the enemy in return and that's questionable right now, especially without shermans, which also compete for fuel.