It looks to me like the VAP position in question is a line the Dept. wants to have TT at some point but cannot get the admin. to approve right now. So perhaps a position like this would last at least 2 yrs, if one performed well, and if a TT search for the same position was not approved anytime soon.
Based on the depth of the SUNY budget woes (and the strangeness of their process for approving new TT searches), that 2 years could become more like 4 years.
I am at least relieved to hear that the teaching load might be 2/2. Four courses per year would give me great teaching experience without being too cumbersome to get anything else accomplished. (I'm assuming there would be minimal service expectations for a VAP.)
If it's a position they intend to be TT, I would assume rather that there could be maximal service expectations. I know visitings at one SUNY who are advising dissertations, for point of reference. But it would still be good experience, good luck with that search...