Around the trailer world (rv and non rv) towmax = blowmax.
There are better tires out here for a heavy trailer.
I doubt a 16" LT E at 3042 lb capacity will work on a 40' trailer. However if the trailer has 6k axles a commercial grade all steel ply carcass tire like a Bridgestone R250 is tops.
And the Sailun S637 all steel ply carcass in a ST235/80-16 G at 110 psi 4080 lbs capacity will give you many years of service on trailers with 7k axles.
Other 16" ST G commercial class tires that are popular for service trailers are Gladiator QR35.......and Samson GL285....Hercules H-901. These tires work fine for rv trailers also.
New gen ST E at 80 psi and 3500-3640 lbs capacity like Goodyears new Endurance......Carlisle new HD.....and a Provider...... with L and M speed ratings and much improved reliability service over the older ST class of tires.
And don't forget Goodyears G614 LT235/85-16 G at 110 psi and 3750 lb capacity.
"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers
'03 2500 QC Dodge/Cummins HO 3.73 6 speed manual Jacobs Westach
'97 Park Avanue 28' 5er 11200 two slides