With going cross country, I wouldn't be changing horses in the middle of the stream if I were you, going to synthetic. I'm running Castrol 5W30 right now; tis fine. On that note, check the temp that your coolant is mixed for, as NOTHING will leave you beside the road faster than a freezeup. Symptom: temp gauge goes upupup until you decide to pull over or it yaks coolant everywhere first.

Was wondering if you had a heat pad and extension cord for the oil pan? Makes a difference.

Toss a piece of cardboard under your sleeping pad for the front grille in case you actually DO hit cold weather (windows freeze up) along with a half dozen zipties.

Water can go in the sleeping bag with you if in a pint bottle, no biggie.

Other reason for getting off the road at night, esp out west is ELK and SHEEP. Not like a deer or moose where you might have one or two out there. NOT PRETTY. Elk usually move at night; sheep up in the Rockies usually come down to the road to lick up minerals, so you get to dodge them. Depending on where you drive thru, there'll be caribou also, but that's more on the AlCan. You'll DEFINITELY have company going through Banff.

When are you guys rollin' anyway?