In late 2012 when I last considered a new tractor, settling on a Kubota
L3560, I considered a cab. My Kubota dealer here in flat Florida discouraged combination of a cab and "loaded" rear tires for the modestly powered
L3560. He felt the weight of the cab, about 600 pounds, applied about as much weight to the rear tires as "loading" the rear tires and it should be cab or "loaded" rear tires, not both.
I am not sure dealer would have made this recommendation if the
L3560 had 50-horsepower or 60-horsepower, rather than 37-horsepower. In the end decided to go open station, rather than cab, as my two previous tractors and air inflated tires. I always carry Three Point Hitch counterbalance, usually around 600 pounds, except when working on residential lawns, which would involve tree trimming.
It it is too hot, too humid or raining, I simply leave the tractor in the garage. I am retired. There is always tomorrow.
Loaded tires can be 50% to 75% full, leaving air for compressibility. There have been reports from operators that drive tractors on public roads, presumably over 15-mph, the the drop of fluid from decreasing centrifical force when slowing from speed can be unsettling the first few times it occurs.
Iron wheel weights, in lieu of liquid, are another option. No slosh with iron wheel weights.