First thing I always do before a trip is a run with the Battery Tender to get that battery up-to-snuff.
I check the push rods, take a look at the points/condenser...and check the tires and air pressure. I adjusted the chain a touch. A twice around shot of my Amsoil chain lube (I like best).
My mousetrap (clutch) wasn't goin' all the way forward on some operations - so I adjusted that a bit - lubed the springs and all joints with my Lincoln Spray Grease - now everything works all nice and quiet ! No squeaks ! I removed both plugs - and they look exactly the same, you can't tell which cylinder they came from - but I switch 'em anyway each time. Oil level is good in tank and tranny(just about 1/3 way up the throw-out bearing).