thanks Alvin. yeah it was a lot of fun for sure!
traeg what I did was bolt two D-rings on the floor directly below the seat, left and right of the kiddo seat, and one between those a little further back, for that strap that goes over the back of the seat. you might not have enough space for that 3rd one, maybe you can put it on the back wall of your cab? I got simple D-rings from Lowes, the whole system is rated at 3600 pounds, that should be enough. be sure to check your state laws though, in Alabama this is legal, but I wouldn't know if that's the same in other states