It seems that lot’s of posters on the subject of replacement tires in this forum avoid compliance with federal regulations.
The statement below is a verbatim copy from the current regulation for trailers less than 10,000#.
S18.104.22.168 Except as provided in S22.214.171.124, the sum of the maximum load ratings of the tires fitted to an axle shall not be less than the GAWR of the axle system as specified on the vehicle's certification label required by 49 CFR part 567. If the certification label shows more than one GAWR for the axle system, the sum shall be not less than the GAWR corresponding to the size designation of the tires fitted to the axle.
NHTSA amends that with a safety standard that says replacement tires must be of the same size and equal or greater load capacity than the OE tires. Or, something else recommended by the vehicle manufacturer.
Michelin, Firestone, Bridgestone, Goodyear etc..etc.. View replacing OE ST tires with P or LT tires as a misapplication thus voiding any warranty coverage (s) for such applications.
Maybe some homework will provide replacement tires from other options, especially with a vehicle manufacturer’s recommendation.
On another note. CapriRacer IS a tire expert and has access to current T&RA manuals. I expect his figures to be correct when it comes to load inflations and tire pressures.
USN - RET - PDRL
DoD & SSA - RET