bad tires , best replacement 235/80r16

My fiver came with marathon st tires. Within months they where pregnant (sidewalls balloning) the dealer replaced all 5 tires with new Marathon. Sometime the next year 1 tire sidewall balloned so I sold the rims and went to 16 inch Lt tires. I bought uniroyal larado lt225R16 load rated E. They served me well for 6 years and about 16K miles. Then coming home thru Texas I blew 3 of them in one day, along with the damage to the fiver. Not sidewall damage but stright across the thread. I brought 1 carcus back and took it to the dealer and first thing they said. ST tires belong on trailers and LT tires belong on trucks. I told him that the wheels on the trailer follow the truck and whatever the truck hits, so does the trailer. the trucks tirs have over 60k on them and are the same age as the trailers. Always covered and off the ground if it will not be used for a time. I have the CAT paperwoork to show that the trailer only weighed #7780 and that the 4 tires were capable of #10700. I only went in for information as to why they blew. I had checked all tires before starting the day and again just before the second tire blew and checked the temp with a laser thermo (about 124 degrees) I guess and kind and any brand can ruin your day.