Looking good!
You're going to be a bit short on time for hallett for these suggestions but see if you can get a weight distributing hitch with clamp on brackets. Highly recommend the blue ox brand.
It will make a huge difference in stability, comfort, and sway.
I am not a fan of open hook straps, closing end straps like these are the way to go.
"Mac's Custom Tie-Downs 121007 Mac's Ratchet Straps | Summit Racing"
https://www.summitracing.com/parts/mtd-121007
My preference is to use axle straps on the rear axle tubes at a minimum, cross the closed hook straps hooked on those to the trailer, but you have to be careful with those as you can damage the brake lines.
"Mac's Custom Tie-Downs 121724 Mac's Axle Straps with Sleeve | Summit Racing"
https://www.summitracing.com/parts/mtd-121724
I permanently installed these hooks to my axle with longer UCA bolts:
https://vorshlag-store.com/products/...-loop-kit-pair