Haulmark bought the cheapest crap tire you can
buy(Carlisle) they could blow with just the weight
of the empty trailer... I run a 43' trailer with 2
axles.. very heavy duty ones.. I buy the best tires
for the 16" rims.. I have had 1 blow out.. that was
after 7 years on them.. and that was part my fault..
the wheel cover fell off on the sunny side of the
trailer and it sat for a few months like that.. I run
the MAX air pressure the wheel can take..95psi and I
check the pressure EVERY time that trailer goes out the
drive way(the tire can take 100psi but the wheels are
only 90psi so I run a couple psi high for the wheel
EDIT
The 43' is not Haulmark.. thats my home made
trailer.. my old 26' was a Haulmark