I would not recommend putting tire chains on the front wheels only. I had a Kubota
L245DT for several years and lived on top of a mountain (4000' elevation). I hated how bad the tractor rode in high gear coming down while plowing so I took the rear chains off and left the front on. Every year I would break off one to three teeth from the 52 tooth bull gear that was used to power the front driveline.
Every spring I would go to the Kubota dealer and buy the gear and replace it. The cost of the oil and gear was around $200. The last year I tried to purchase the gear I was informed Kubota no longer carriers the gear and I would have to have one made (>$500). I decided to trade the tractor in for the
L5030 cab.
The mechanics told me that unless you have a MFWD then most tractors have what they called "front wheel assist" and not a true 4-wheel drive unit like a pickup truck.
The tooth on the bull gear would break everytime I would be coming up the mountain and all the wheels would be spinning, I would pick the snow plow up a little to add weight to the front tires so the chains could bit in and the front tires would grab and the rears, without chains, would continue to spin. I would here a clank and know I just bought myself another tooth.
Anyway, just a word of advise, if you live on a mountain and use chains, it's more important to have them on the rear than it would on the front unless you have MFWD.