Having towed multiaxle trailers for a living and having had many a trailer weighed in a loading yard and by DOT I found out the hard way the suspensions equalizer bars do not equalize the weight 100 percent. Its possible to over load the rear axle with a nose high trailer BTDT and a costly mistake by a rookie owner/operator.
Now....one size don't fit all as some folks use tires on their trailers with enough reserve capacity that eliminates overloading in this case vs another trailer with tires that have little to no reserve capacity.
Now add the fact some folks for unknown reasons don't use max sidewall pressures in their tires on a trailer. This causes the rear tires to operate in a run hot condition.
And of course tire quality. A poor quality tire won't last long if its ran hot continously in this situation.
As others say get some scaled axle weights for a base to start with.
