Steve, same issue here. I don't like to use A arms, so I use the center point of the rear A- frame for BOTH rear tie downs, and crisscross the straps. In other words, both straps are hooked around the same spot at the rear of the car. It's probably not ideal, but it works.
Other trailer thots. Get a spare tire/wheel for the trailer and a lug wrench/socket for that lug size. Check air pressures (mine were 14 & 50 lbs on one side, 37 & 28 on the other -I guess the dealer thot if total pressure was the same, per side, it was all good).
Make sure hitch is hitched, even tho mine was, and safety pin was in place, I hit a huge bump and it off it came-turns out I had somehow clipped it in place on top of the ball, not below. Impossible? Apparently not. Fortunately it just made huge noise, trailer bounced violently, I stopped, saw problem (bump had knocked safety pin 1/2 way out), and re-hitched. So now I do a short, but sharp start-stop after hitching to see if there are hitch issues.