I have a tow strap kit from Summit. I think it was around $150, and looked similar to a Mac's kit I was researching. Whatever straps you get, I would make sure they clip on (a spring loaded gate so they can't fall off if they become loose)
I use that same strap kit from Summit. Have had them for about 2 years I think. Very pleased with them.
I use axle straps at the axle. On the front, I strap to the welded D rings on the trailer frame rail so those straps are not perfectly straight, maybe 30 degrees. On the rear I strap straight back.
I have also read, as
@BigPrince mentioned, to have at least one full wrap on the ratchet. I have been doing this for the last few years and rarely have a loose strap when I check them. Rain can seem to loosen a strap and if it is raining or starts to rain on my trip I will stop more frequently to check them.
I also check all four straps whenever I stop to get fuel or food, etc and visually look at the tires to see of the jeep has moved any on the trailer. With the wider axles now, my tires are over the frame rails just a bit and I am much more cognizant of checking to make sure the tires have not moved.