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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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97 E350 SRW minibus, E4OD/D70/4.10, 19.5 whls, BD trans pan, 3 batteries & inverter, tach dash
93 W250 6BTA/5spd/D60/D70/3.55
90 D250 6BT/5spd/D70/3.55
Other rigs I wrench on:
95 F350 CC 4x4 ZF 4.10 Lockright/Detroit, T444E J/W pump, hydroboost, EBPV brake, straight pipe, 5.6k mod, 4" lift, 35" Toyos
Ford 6.9/7.3/IDI/turbo/PSD, 89-02 Dodge CTD
Marine Engines I mess with:
Mitsubishi S6U, S6R, 6D14; Mirrlees National KVSSM; DDC/MTU 12V2000; Cat 353, 398, 3306, 3406
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