Well, the LHT currently has a granny gear. The road bike doesn't but I have the old crank it came with that does so I can switch that out. The LHT can certainly carry more but I could put a bigger seat bag and a handlebar bag on the road so it can carry more. Of course, even if I add a bag - the LHT still carries more. However, the LHT is heavier by far but it was very comfortable to ride for the last tour. Very comfortable.
Savra
2006 Specialized Dolce Elite/Specialized Stock Saddle
2011 Surly LHT/Brooks S Flyer