Those rims are Robby Gordon. I think that's a removable beadlock but not a True Beadlock rim so it wont say off road use only. $365 a piece so they're pricey but I love those. I was actually looking at getting them but in the machined metal. As far as the KMC caps I can't tell you anything because I have no idea.
Thanks again Range, those are Robby Gordons. I checked out their site and you're correct these are designed for street use so the beadlock is simulated. I love 'em.
It looks like the Robby Gordon's come in 17x8 for the '12 4Runner. I like the look of the Toyo's that are often shown on them, they even have a special of $50 off each tire if you buy them as a package. I'm also partial to the BF Goodrich AT's as I do more onroad than off and I like the squared off look.
I'm going to throw in a bit of additional information into this post in case someone stumbles on it in the future just starting out their search.
This link has pictures of most of the major tires all in one place:
Tires*Tires*Tires*Tires !!!!! - Tacoma World Forums
Below are a few wheels similar in style to the Robby Gordons:
-KMC XD125, XD Enduyro
-Axis Regulator (these seem to be discontinued)
-Raceline 925M Havoc
-Mickey Thomson Classic II in black (does not have beadlock)
I also found the link below helpful. When searching for wheels I always gravitated towards the look of the beadlocks. This article explains what they are, why they're useful, and why they're not practical for daily driving. This helped me understand that I should be looking at a beadlock simulation or look vs an true beadlock wheel.
Bead-Lock and Faux Bead-Lock Wheels