As of the Intel 7 series chipsets, there is full support for TRIM in RAID. I am not sure on AMD either.
If you do it though you will have the controller in RAID the HDD will be in RAID but it wont be in the RAID itself.
To be honest though, SSDs in RAID 0 are pointless. Other than getting the extra space you wont notice the performance increase for the most part.