I owned a Kubota B3300SU for two years, a predecessor to B2650 without the mid-PTO but with a factory loader standard.
For its considerable power versus light weight I found my 'B' to be pretty tippy. I had air inflated tires. I recommend liquid filled rear tires for stability.
If you tarp the tractor use a permeable canvas tarp. A plastic tarp will condense moisture under the tarp on the tractor. TSC sells light canvas tarps but I prefer the heavy 18 ounce offerings from Chicago Canvas, as they are heavy enough to remain in place without being tied down. Purchase 12" wider and 12" longer than you think you will need.
I garage my tractor but my multitude of implements are outside under Chicago Canvas cotton tarps.
LINK:
chicago_canvas | eBay Stores