I fish a 37 acre lake and they stock it with rainbow trout and I've been suspecting the bass eat them and today was proof I was talking to a guy who caught a 5-6 pound bass that had a rainbow trout deep in its throat only the tail sticking out. He even showed me pictures. What should I try? How long do trout live in a stocked lake? the stocked trout are about 10-12 inches and some are bigger.

Sounds like you need to get into swimbaiting...

Haha that's what I thought

How many inches is that and how much?

Huddleston Deluxe 68 Special- Rainbow trout

Match the Hatch!

 

As shown above, try to mimic the baitfish in color, profile and size.

 

Good luck.

What kinda set up do u use for. 8 inch swimbaits

Need a 8" Huddleston or Savage Gear Line Thru.....the Savage Gear is a little less expensive.  Pro Cure Rainbow Trout sent, here is the cost effective swimbait set up. I have 2 of them btw.  Go to BPS or go online, order the 7'6" Graphite Musky Rod H, a Cardiff 300, some 40lb power-pro, topshot of P-line CXX 25lb or FC about 15ft long and leave the rest of the gear at home and go fishing. 

8 inch huddleston-Rainbow trout color! :)