I have an L4150DT (new to me) with recent R4 tires on rear that have ballast from dealer in central California. I am using it in foothills where we get freezing temps several times during winter. I am 3000 feet, so I experience the temp change overnight for a couple days if it gets that low. Should I have the loaded tires treated with the Calcium Chloride additive recommended by Kubota for anti-freeze? Or does the air space give enough cushion for the temporary freeze? Thanks, Chad in Mariposa, CA