You can use tire chains on the rear tires of a 1025R TLB without wheel spacers if you have R4 tires and you carefully place the cross chains in the grooves of the tire tread and make the chains tight.Welcome to GTT!
It's normal. There is very little space between the frame and the tire. The frame at the front edge of my left tire shows metal worn bare due to the rotation of mud caked tires. I've not experienced any problems due to the limited clearance, but there's no way I could install chains without first installing wheel spacers.