I liked to tie my down in a couple of ways over the front &/or rear tires strap type baskets then a tab in front & rear to take some of the bounce out of the chassis, with a big rig 21" truck tire tube under the chassis rails inflated for long road trips cross country especially it takes some of the stress off tube chassis cars especially, it's good for a reg. car too...
I put the recessed 2" or bigger D rings {use regular ratcheting type straps} in/on the trailer floor {pref. with a solid brace near/below it to bolt to} in front & rear of both front & rear tires, close to where the car is usually parked, I had adjustable ones on a rail down both sides of the floor in my Featherlite trailer too, but you can mount/put them permanently them where you want, so you don't have to have long *** straps fighting with the extra length/strap all the time...
I also put a tab on the front of the k-Member to pull the car in {winch if need be} & mainly to tie it down in front, to help load the suspension some too...
In the rear I tied it in 2 places under the rear axle area & went over the axle tube, rear shocks were pretty stiff...
you could tie it down with tabs on the frame in the rear too, if you think it moves too much or it's putting too much wear & tear on your shocks/rear suspension, that's partially why I did the truck tire tube under the chassis, to help keep it from bouncing...
I did that for 20+ years never had a car come lose, never had a problem with bending lite race wheel either that way...
If any of that makes any sense...
I've seen a bunch of different ways to tie the m down, that's what worked best for me,
I put about 25k miles min. a year on my ol' tow rigs, hauling my door cars & altered all over the country for decades... & Hardly any now...LOL
Summit has some inexpensive ones click on the photos it will have prices & part #'s
I didn't use either of these brands just an "example of the type I used"...
they range from $35 ec. to $200+ for a pair, depending on what style/brand...
The Mac's 360* tie downs recessed loops look good price kind of $30+,
convenient to be able to tie from different angles
the others are relatively cheap $8-$20