Yes, that is the 3 pieces rims that I also have on my pick up. My method works easier using the tire changer with the plate and blocks. I inflate on the changer with the plate on top and a bar kitty corner to it, just in case something decides to fly. Having changed regular split rims and the 3 piece units when I was in High School working at a service station, the 3 pieces are a better and much safer than the old two piece split to inflate.
Here is a source for 16.5 tires
https://www.stausaonline.com/tires/sta-super-transport/