Need Help With Sub Box

[slipknot1joey 0]

Hey guys, i am looking for a box design and was hoping one of ya could help me out. Its for 2 18" BL's powered off one rf t3000 going in a tahoe. I would like the dimensions no bigger than 28x48x22 if possible for daily driving tuned around 32hz subs up port back. I really dont trust myself designing one, but i guess thats one way to learn. Any help is appreciated.

[rushnrun 14]

sub up ports back works well..

I've got a buddy w/a 93 full size blazer that we constantly change his setup.

the best performance has been the subs up and ports back..

everything up not so good.

everything to the rear OK..

[07_ZX10 4]

my box in my expedition is subs up port back, bl 18's tuned to 33hz with about 206 square inches of port. Sounds real good like that too