6th Order Band Pass in Spare Tire Well, 2001 Ford F-150

I have 2001 F150 SuperCrew. Currently I have a 12" in a .78 cuft sealed box. But I want to use a different 12 in a band pass box where my spare tire rides, and run a port from the box under the bed to just behind the rear seat. There are several reason I want to do this, mostly it's cabin space restrictions. So from the front of the box to where it would enter the cab is roughly 4 feet. Can I run a large port to keep the tuning around 30Hz? Maybe two 3" ports? FS(Hz)     23.32 VAS(l.)     99.97 QTS     0.44 QMS     10.28 QES     0.46 BL(Tm)     16.9 CMS(mm/N)     0.208 RMS(kg/s)     3.193 LE(mH)     3.05 MMS(gr)     224 VD(l.)     0.751 SD(mm.2)     53100 X-Max(mm.)     14.15 X-Mech(mm.)     0 RE(Ohm)     4 General specifications Max power(W.)     1400 RMS power(W.)     350 Number of coils     1 Impedance Z-Nom(Ohm)     4 Reference efficiency η0(%)     0.27 Sensitivity(dB) 1-W     86.2 Sensitivity(dB) 2.8-V     89.2 Mounting information Speaker displacement(l.)     0 Total diameter(mm.)     310 Cutout diameter(mm.)     276.1 Mounting depth(mm.)     165.1