What "chassis" do you mean?  There are no splitters.  You have to daisychain.   If a device has only one Thunderbolt connection, it has to be at the end.

I have been keeping up with the Thunderbolt stuff for a year now. It is pretty disappointing that no one, Apple or otherwise seems to have any interest in Thunderbolt. I have a Thunderbolt external drive, and I am quite pleased with its speed.

I think there is an inherent flaw in how Thunderbolt works. It relies on devices to be daisy chained together. This is great concept, but there's a problem. Say I have a Thunderbolt Buffalo external drive, a Blackmagic Intensity device, and a monitor that connects via the Thunderbolt port. Oh wait, all 3 devices must be at the end of the chain! Even if I was to spend over $1000 on the apple monitor, I am still limited to the number of devices I can connect.

In other words if most Thunderbolt devices have to be at the end of the chain, then how on earth can the technology ever be truly useful?

Don't buy Thunderbolt devices that have only one Thunderbolt port, and tell the manufacturer why.  Two port disk drives and monitors are available, so only the Blackmagic device has to be at the end.

I wish I read this post before I went out and bought two end of chain devices!! Unplug re-plug with only one TB port is really annoying!! Won't make the same mistake twice, but these devices areall expensive so not happy there is no solution!!

Belkin have a hub that gives 2 thunderbolt outputs.

Belkin Thunderbolt ExpressDock ..

Try looking this up

The Belkin dock (and every other dock that I can find online) has only 2 Thunderbolt ports (an In and an Out).  In order to "split" it to use it for 2 different devices (BESIDES the computer), you NEED THREE THUNDERBOLT PORTS - one for the computer, and one for each of the 2 devices.  Most Thunderbolt devices available today have to be on the end.

You always need 3 ports to "split" a connection.