To install an IGH on the LHT you'll need either a chain tensioner (the part that pulls on the chain in a derailleur) or an eccentric bottom bracket. The reason of this is that the LHT has vertical dropouts and that you can't get the chain to the right tension otherwise.

Other than the LHT there is the CrossCheck. This one has horizontal dropouts. Chances are that it will suit your style better than the LHT, being much livelier. It is quite suited to light (40-50 lb of baggage) touring.

I own an LHT myself.