Wow! What a great trip! You'll have your hands full now and again managing 5 riders. Getting food for 5 can be slow, Hotels may or may not have rooms for you. But often Hotels have "cuartos familiar" (family rooms) ... which are perfect for 5.
I don't know how to use GPS well myself but I see it as a big advantage in places ... like cities. Very handy! Sat pics good when in rural mountain areas on dirt roads.
All on same bike is brilliant. So many KLR's on the road down there ... you may even source parts from abandon KLR's or ones in workshops.
I hope someone in your group speaks good Spanish ... it makes SUCH a difference. If not ... take classes along the way. Mexico (San Cristobal is good),
Antigua or Chela, Guatemala also popular for classes.
October is the PERFECT month to head South ... wish I could be going with you.
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