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[quote user="samfp1943"]GCW's as they go up, will probably see Federal Regs mandate more axles, and possibly larger tire sizes(?) [/quote] The is something called Federal Bridge Weight Formula that allows to compare a truck and its axle loads and spacings against the the AASHTO HL93 design load: <a href="https://web.archive.org/web/20030308203728/http://www.randmcnally.com/pdf/tdm/Federal_Bridge.pdf">https://web.archive.org/web/20030308203728/http://www.randmcnally.com/pdf/tdm/Federal_Bridge.pdf</a> The formula was developed for single-span bridges. two-span bridges might not be protected by this formula. I don't know which length or maximum axle spacing limits apply. Taking the longest axle spacing of 60 ft from the table, 5 axles allow 85,500 lbs, 6 axle allow 90,000 lbs, 7 axles allow 95,000 lbs. Larger tire sizes are not necessary as long as the allowed axle load is not increased. Regards, Volker
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