It looks like you want to have two routed links on the connection from the SRX to the EX switch with /30 addressing. This is not a layer 2 trunk port but layer 2 routed interfaces. Once the interface is layer 3 you cannot mix it with layer 2 functions.
If that is the case, you add a second unit to the interface with the next family inet address plus add the vlan-id parameter with a matching vlan tag number on both sides. for example:
set interfaces ge-1/0/0 unit 1 vlan-id 5
On the switch you add the matching vlan-id to your vlan so that it ties in where you want the traffic to be carried across the switches.