Hello and
to the forums. While you have a nice question, no one here is qualified to answer. Look up DCASTEEL under search, advanced, and usernames. He is a factory rep. Shoot him a private message if need be, and he should be able to give the factory number. The last question on ramp weight was for a 34fbk (think that is the right model), and the answer was 2500 pounds rolling weight, one axle at a time. Your Kubota is going to be on the ramp all at once, not long enough for only one axle at a time.
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LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT