As far as D Rings go (I call them shackles which is what we refer to them as in the construction industry)) There is some difference concerning the manufacturer of them. The Crosby Group is in my opinion one of the best manufacturers of shackles and lifting gear. At work we have Crosby shackles and then we have the china shackles. The load limit on them is really quite significant. I use shackles and nylon straps quite extensively at work (ironworker/rigger/structural welder) and that is what i have in my vehicle for off road recoveries. As far as towing a vehicle while i have done it a dedicated tow bar is the best method rather than straps or chains and having to rely on the malfunctioning vehicle's braking system.

Then again my recovery bag contains wire rope, a come a long, various shackles and straps and on my three way tow hitch i have welded a picking eye so i can use that as an attachment point at the rear.

regarding your tow rope Colbyhouse is it actually rated at 55,000 lbs because i would like to see that strap it must be a four or six ply in my opinion.