Linux RHES platforms for TS 6.7.x

System

I see in the release notes for TS 6.7.1sp1 that RHES 4 is supported and the release notes for 6.7.2 that RHES 4 & 5 are supported. Has there been any new testing for these TS releases on RHES 5.2?
I am looking to determine the best RHES platform for an upgrade of my TS 6.5 platform and I have heard that there have been some auxilary software problems with RHES 4 that makes RHES 5 more desireable. However, I see no mention of RHES 5 in the published TS 6.7.1sp1 release notes. Has anyone done a deployment of TS 6.7.1sp1 on RHES 5.x?