Need Enclosure answers

I dont need help. I need a Answer

ok im not beating around the bush because I've tried to figure this thing out but its just not happening for me.

I Have a 2.7cbft Box (Net Volume) I have 3- 10" Pioneer Premier Champion Pro subs inside of it. It is a Common CHamber Box and I am willing to do 1 or 2 ports.

The Round Port Suggestion for the subwoofers are here (IM sure thats single Chamber suggestions)

0.9cbft 3 x 3.5 (inch)

1.2cbft 2 x 2.5 (inch)

0.6cbft 3 x 7 (inch)

Resonance frequency is 34.7hz
Xmax 11mm

But I have a common chamber because im building under a truck seat and it has alot of bumps and grooves.

There's the manual if that helps any. I just want some suggestion on NET port size HxWxD thanks

http://www.pioneerelectronics.com/St...Manual1120.pdf