I think it's been covered, but going slow and knowing your precise height will address most of the concerns.
I'd recommend avoiding the Dalton and Denali with your big rig: It can be done but that doesn't mean it should be. I've seen big rigs on both roads, but it's not ideal. Take your toad there. FWIW, in my view, I'd park the big rig on one side of the Denali (say, Cantwell) and toad in partway, then repeat on the other side (Paxson) when you go that direction. You shouldn't miss the Denali or its scenery. Probably the same with the Dalton but (prolly since I drove it too many times while working and when it was called the haul road), the Dalton has never quite grabbed me like the Denali does.
I'd also suggest considering just the toad for Kennicott / McCarthy. While that road can certainly be done by big MH's, it's long, bumpy, and will leave a fair amount of dust or mud in your rig. The CG's on the Kennicott / McCarthy end are not overly blessed with amenities, so you'd have to come in with full water and empty black/gray tanks if you're going to stay on that end. I will admit to not getting the hype about McCarthy, but the locale is spectacular and the scenery of the Wrangell-St. Elias is awesome.