For me tubeless touring is still a bit of a no go. I tried it last summer and while it did work to some extent, the Marathon Supreme rear tire I was using was wearing at a ridiculous rate. We were on the road for around two weeks and honestly I'm not sure the rear would have survived a whole month. I do have to say that the Supreme compound is grippy and fast, but it's not durable like the Marathon Plus line.
So it really boils down to the low selection of heavier duty tubeless tires. There is the Marathon Mondial but last I checked the tubeless models were only in 50mm widths which is too wide for my LHT. I guess the optimal tire would be a tubeless ready marathon mondial as it has good tread thickness, good offroad grip and the tubeless thing would more than make for the lack of the smart guard protection plus tires have. I suppose in tubeless it could be even lighter than normal as long as it still retains rigidity for heavier touring loads.