are you having trouble with trenches? seriously? The thing is a death trap, every time I put my squad inside one they get insta rekt. I rather make sandbags that are free and more durable.
The only real usage of trenches in my opinion is to put a vet 1 vickers inside it so you get the extra range bonus, but even then it's not that worth the trouble.
and yeah, mortars/Leig are the best counter, ATs can work too, but it's rng dependent.
ost t4 needs a generalist tank. Panther is too AT focused and Brumbar is too AI focused and having 1 of each is 300+ feul, on top of the costs of teching to t4.
Lie. brumbbar just beat up any medium tank head on.