I used 210lts in my GUIV TD42Ti
Liftlid did most of the leg work in terms of permit applications for our trip and his info is on the money. Camp 3 & 4 are restricted and you will most likely not get access there.
It is an amazing trip and one that has been fairly heavily travelled in the last few years. There are a few options and TPC also has done the Madigan.
Very happy to pass on knowledge and I'd love to do it again but there are a couple of other trips like CSR that I'm real keen to point at in the next couple of years too.