I'm an old bike fan too and I say go for it .
But and it's a big but , you will have to prepare the bikes for the trip .
Wheel bearings , fork seals , stronger rear shocks etc ,
If they burn oil ,then get them checked out and rebored or maybe a valve job done before you go .
Give the bikes an overhaul and they should do well for you .
Blessed are the cracked, for they let in the light. - Spike Milligan
"When you come to a fork in the road ,take it ! When you come to a spoon in the road ,take that also ."