A buddie of mine did that on his five, he also made a 4x4 square tube tire carrier that was pressurized and held 120psi. not sure how many gallons it was but it would put a 37 back on thee rim because he used the high flow connectors.
Rich


07 Mercedes GL 450
93 Freightliner FL 70 C/C 8.3 cummins, allison auto
96 Toyota T100 4x4 xtra cab v6 5 spd
05 KZ 41kx2 NV Toy Hauler 14'garage 43'of 5r
04 polaris 500 HO 50th year limited
02 polaris 500 HO
51 willys M38
56 Dj