Steps:
1. put the following commands into command blocks
summon MinecartRideable ~ ~1 ~ {Passengers:[

]}
tp @e[name=V1] ~ ~1 ~
2. Activate the command block that summons the minecart with a armor stand inside of it.
3. Activate the command block that will teleport the armor stand that is inside the minecart.

Expected Results:
You are able to teleport the armor stand while it's in the minecart. If the armor stand has no gravity the minecart and armor stand will float in the new position.

Actual Results:
In 1.8 you are able to teleport the armor stand like in the expected results. In 1.9.2 you are unable to teleport the minecart and armor stand together. You are able to teleport them each individually (Armor stand alone, minecart alone). you are also able to teleport the minecart while the armor stand is riding but will not float when the armor stand doesn't have gravity.