How are you tieing down your car in your enclosed trailer

Not worth the effort unless you plan to do a lot of hauling of that vehicle IMO.
Even then I'd go with straps around the axle
OR the wheel strap "baskets" as used on tow dollies, etc.

A lot of trailer queens on that site. With laminated lists of the procedures for loading and unloading.
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I added a leaf.
So.
I don't have much extra thread.
I like the "baskets"..... I've used them.