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There are some other 16" tires that have higher load ratings.... a number of 285/75 and 255/85 are rated for 3750# now.
Another route you can go is 19.5" wheels and tires... even if only on the rear. That's what I did on my work van and it is much more stable. My 245/70R19.5s are rated for 4800# each. They have a steel ply in the sidewall also.
I don't agree with Ford's axle ratings. If you notice, the SRW axle ratings are exactly equal to the load capacity of two of the stock tires. IMO, the rear end can handle more weight. FWIW, the 5.4L F350 duallies used the 10.5" axle and the rear GAWR is higher.
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95 F350 Crew 5spd/4.10, SuperChips tuner, solid flywheel, T444E waterpump, 205° stat, Locked F&R, 9.00R16 Michelin XLs
97 E350 SRW cutaway, E4OD/D70/4.10, 19.5s on the rear, deep trans pan, batteries inside, 1800W inverter, manual glowplugs
Other rigs I goof around with regularly:
93 F350 4x4, 7.3 IDI turbo, 5spd, 4.10s
90 F250 4x4, 7.3 IDI, 5spd, 3.55s, D60 swap, straight pipe, turned up fuel screw, 9.00R16 Michelin XS
Other Engines I mess with:
Mitsibishi S6U-MPTA
Mirrlees National KVSSM MK-II
DDC/MTU 12V2000
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