They are great vehicles and a great option for those able to write the check. However I never saw a single one in Alaska, the Yukon, or the Northwest Terriotories when I was up there in my 18,500 pound Fuso 4x4. I'm not sure the data agrees with you on them being "the only way to go"
If there is a thread on the forum about your vehicle I'd love to be pointed to it. I'm closing in on completion of a comprehensive vehicle, built on a 2017 FG and wish I could have kept the weight lower than 13,500. I'm eager to hear how you successfully accomplished yours.