Not to shoot your hopes down too far, But hunting in trash that thick sucks with ANY machine. There is no magic machine. Some machines will separate better in dense trash but it is still no fun. Generally there are machines known for how fast they separate. The Etrac will work and find goodies but the it is not super high on that separating list, that would be a lot of money to spend for that purpose only. Hell I have a super clean one for sale in the classifieds and I am telling you that.
On the other hand the Etrac is one of my personal favorites overall. It and the CTX for me are BY FAR the most fun to run and will pull you many deep coins and help you dig less trash.. Speaking of less trash one other bonus with the Etrac and CTX is that you can dependably descrim out Corona/beer caps. They are only the machines to do it dependably no matter how many people tell you how they can bite their tounge, hold their breath and do the hokey pokey just right to tell what they are with other machines :
Good luck with your hunting and get the small coil for the AT if you don't already have it. It will work better in trash. PS.. I do believe the ETRAC is a big upgrade over the ATpro as well.