snapper lt16 rims and tires

I have a lt16 and im looking for rear wheels and tires for winter , im having trouble finding what i can use, i waa reading that some people use atv front tires , i wanted to put chains on them also, i live in buffalo and was blasted with all the snow and couldnt get traction at all for the snowblower, i have 2 cinder blocks attached to the rear also for weight, any suggestions on tires? Im not sure if i could use a different size rim