I was going to state that, but didn't want to come across as a know it all! HA! Your completely right! And you don't want one strap in the rear, I was involved in a head on crash early Jan 17, had four straps, two of them snapped, one in the rear and the other in the front, if my trailer didn't have a top rail, our S x S would have ended up in the bed of my truck. I had a 50% failure on my tie downs. You only have 50% to start with?
BINGO and you only have 2 strap out of 4 keeping it out of the cab of your truck.
The over tire straps, all 4 are keeping it in place, it allows the suspension of the SxS to absorb some of the energy of bad roads and it makes the ride of the tow vehicle and the trailer better.
Each of my 4 tiedowns is working load rated at the weight of the machine so I am at 4x the working load and 12x the break strength of the tie downs and tie down points, my etrack is bolted through wood and where there is a cross member bolted through them. It’s working load is right at the weight of the SxS at each tie down point.
Honestly I’m more worried the wood itself and the cross members may fail before the straps and tie down points do.
IF I have a wreck I don’t want the Pioneer as a 1800lb projectile through the back window to be a very high possibility.
In traffic or on the interstate I AVOID the $80k truck pulling the $40k SxS on a $500 trailer with $10 in harbor freight tiedowns.
Securing a load safely in case of a wreck is the priority not keeping it from rolling off the trailer.