It seems that the negative reviews about size variations are from a few years ago, and based on the one I received, they seem to have the size right. The main block on mine (drawbar?) measures 1.90 inches wide and 1.97 inches tall. My 4Runner hitch measures 2.08 inches wide and tall, so there is about 1/8" of extra space between the receiver and the drawbar. Without a pin, there is quite a bit of play, but with the pin inserted, it's pretty snug.
Considering a hitch pin is meant to be loaded in shear vs the bolt in tensile plus the larger minimum diameter of the pin...I'd go with the pin. The actual block depends on what brand you buy. I think my Smittybuilt is a solid chunk of (Chinese) steel that I really doubt is going to fail before something else. The shackle on the other hand, you'd be better off not getting the Smittybuilt Chinese version.
Use your Roadmaster tow bar to tow your off-road vehicle behind your motor home with these adapter brackets. They attach to the 1" thick shackle mounts on your bumper where the D-rings Features: Adapter brackets let you use your Roadmaster tow bar to tow your off-road vehicle with bumper-mounted D-rings Brackets attach to 1" thick shackle mounts on bumpers approved for flat
Use your Roadmaster tow bar to tow your off-road vehicle behind your motor home with these adapter brackets. They attach to the 3/4" thick shackle mounts on your bumper where the D-rings Features: Adapter brackets let you use your Roadmaster tow bar to tow your off-road vehicle with bumper-mounted D-rings Brackets attach to 3/4" thick shackle mounts on bumpers approved for flat
Last on the list is the Trailhead multi mount trailer hitch d ring. Very similar to the other Shackles on the list. Has multi point positioning to spin the d ring horizontal and vertical. This one  is rated up to a hefty 11,000 lbs just like the rest. Included is a set of D-Shackle side isolator rings that eliminate shackle rattle when the unit is mounted to your vehicle’s hitch. A little bit from each of the others on the list, this is still a solid option. 
The ball hitch on the back of many pickups and SUVs is for towing a trailer. It is not for rescuing an off-road vehicle that’s stuck. That's the job of a shackle hitch receiver. Here we'll explain what a shackle hitch is and why you should have one in your 4×4 or truck. Then once you're educated we'll review the Heavy Duty Shackle Hitch Receiver from Rhino USA. Individual sections will cover:

Replace your vehicle's rear bumper with this sturdy steel recovery bumper. The integrated, swing-away spare tire carrier can hold up to a 37" tire. Welded shackle mounts come with D-rings shackle mounts with removable D-rings let you perform recovery operations Integrated receptacles let you add 2 auxiliary can lights (sold separately) up to 4" in diameter Ground-level lighting allows


The Rhino USA Shackle Hitch Receiver is one of the highest rated shackle hitches on the market today with a great reputation among consumers. Chances are if your a truck enthusiast you’ve already heard of Rhino. With an over 31,000 weight capacity you can probably bet your life on this shackle hitch. Even better when you are buying Rhino, you are support a 100% made in America product and it’s backed by 100% Guarantee. If you aren’t 100% Satisfied for any reason, they will  refund your money.
There are plenty of great parts to choose from when you buy from 4wheelparts.com. You find recovery hitches from a wide range of brands, including Warn, Rugged Ridge and Factor 55. To get a sense of which hitches work best for your Jeep, you simply need to input the pertinent information into 4 Wheel Parts.com's search bar to automatically see the results.

I went out to the warehouse to take a look at the Bulldog Winch Receiver Mount with Shackle # BDW20186 referenced in your question. The pin hole that the shackle mounts to has a diameter of right at 1 inch. As you already mentioned, the shackle itself has a 7/8 inch diameter and the shank is a 2-1/2 inch x 2-1/2 inch, Class V receiver mount. This is a really nice, heavy duty mount that has a break strength of 78,000 pounds and a working load limit of 13,000 pounds. I have also attached...


With that being said though, it all depends on how you plan to use your 4Runner off-road and the types of terrain you see. Because the ARB Off-Road Recovery Snatch Straps have the most stretch, doesn’t mean they are the “best” it just means that they are truly designed for off-road recovery in pulling someone out. Again, like we said above in the material section, there are different recovery straps that perform better in certain situations.
Use this heavy-duty, hitch-mounted shackle as an attachment point for strap, cable, or rope. Powder coated steel resists rust. Hitch pin and clip sold separately. Features: Tow ring lets you attach recovery strap, cable, or rope (sold separately) to be used in agricultural, industrial, or recreational applications Hitch-mounted design ensures quick, simple
Best of all, our hitches are easy to use. Simply pull the side pin and move your hitch up or down to accommodate where your trailer needs to ride. Your Rhino Hitch will be the envy of your friends wherever you go! Whether you’re at the lake, the dunes, the race track, or in the mountains, you can relax knowing that whatever you are towing will be kept safely behind your truck.
Like many others on here I took a chance on a small company I had never heard of. I was expecting good quality but was actually amazed at the fit and finish on these shackles. I don’t need a set of shackles that can support the weight of a fully loaded semi, but I have them. I purchased these to attach their 20’ and 30’ straps together if I ever needed to. ( be prepared right? ) if it says Rhino on it you can believe it will be good quality. Every piece of recovery gear I carry from my shackle hitch to the shackles that may be wrapped around your axle or frame says rhino on it and if it’s you sitting in the ditch you will be glad it does.
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