Well, since it's B/O I will offer my advice as you might want to change your mind. IMNSHO, a 5 WT up there is a waste of time.
You'd be restricted to stocker trout and cutties with a 5 WT.
HSU is in the heart of big fishies country, like salmon & steelhead, not dinky trout.
Yes, dinky trout are also available up there, but why bother? Get him an 8 WT so he can actually catch something without breaking a rod!
PS: If I had only one rig (I shudder at that thought!) to take up with me to HSU, it would be an 8 WT!!!!