Aren't you supposed to beat him before TA? TA is fairly late at 15 CPs. By then, easy 8s and other fun things should tear him up. If he's still standing...you got outplayed mate.
It's true that he has plenty of units to make a complete faction even without the TA, but if he is making use of fuel for his elite troops, that means you can make use of fuel for things that kill said elite troops. Paks come out so send out a pack howie, WP arty, m8 scott, ect. Seriously I think rifle company is your best bet here.
You want to play strategically. Confine him to a nice, circular defensive position, probe it at multiple points, drop WP (or some other kind of arty) on the ATGs or any other unit of importance. Alternatively, he will creep back into a defensive circle, at which point you can just arty him to death.
Seriously just arty. Infantry company works well for this and mech company has good arty. You should have 2/3 of those companies anyway.
Not saying it's easy, but thats how you do it
Not everyone has DLC commanders... Double jacksons are probably your only chance in hell of countering a TA with vanilla commanders and even then the odds are stacked massively in his favour. If you have a Vet AT gun or two it can help but on any remotely urban map that's out of the question.
The range and fire rate are the main problems for me, effectively the TA allows wehr to play your own game at sniping armour from range and come out on top. You can try rushing in but without the likes of a decent medium tank that's just asking for your tank destroyers to be one shotted by a teller mine or becoming shrek bait.