Towing question

[btrc]

This summer I left the track for home and 22 miles later I felt a bump from the rear when I stopped for a stop sign. A couple blocks more and another bump and stop. Decided to look into trailer and all 4 straps were broke. I know they were tight when I left the track. The front straps from the outside into the center of the front crossmember under the engine and the rear ones were one on each side from the axle straight back. The winches were both in front with no adjustment at the rear. I can’t figure out how all 4 could break but it happened.
I don’t have a solution but I bought very high quality straps to replace the destroyed ones. All the straps broke where strap is looped around her hook and sewed together. The sowing thread is what broke.