Just an FYI, as you seem to have already made up your mind... but this is not true. Having done it several times myself, you most certialy do not need to remove the tires.
Well, Just a FYI back, you may want to consult Whites Farm Equipment out in Canastota, and the Kubota Rep that both told me this at the Farm show. If they don't know what they are talking about, then it would be a good Idea to get everyone on the same page before they 86 potential sales. I swear, the number of discrepancies among dealers and the information they give is a bit ridiculous. It's not just Kubota, this is shockingly common among all the dealers I have talked to. From small inconsequential things to things that are much larger. Just so we are clear, we are talking about the B2620.