The reason why you can only get the Yakima clips and wings from a dealer is because Yakima made the OEM for the VX. Isuzu had a non-compete clause with Yakima on those specific parts. So Yakima will never sell, (even though they made), the rack for our VX's. Yakima says if they were to seel the rack it would cost around 175.00 as you can see Isuzu had marked up the price to a over $345.00. Althought at some dealers you can get it for a little lower cost.
As for the height of the A1's, "yes", they sit higher, Some people like that because it clears the back fin alot better than the stock. Also, from my understanding there are alot more accessories available with the A1's vs. the OEM's