I have a L3301 HST and just fill rear tires with RV antifreese it is good down to -50 F 30 gal each, it was cheap on sale $2.96 a gal. added about 520 lbs to the rear.
Well worth it , I had an L3010 GST an had water in the rear tires( no temps much below freesing where I lived at the time) and...