The first year of the rip, some guy road one of those KTM 950 from Oregon to Ensenada then road 1450 miles in 5 days, and turned around and road home. Never heard of him again but he was a frickin maniac just for doing it.
The 650 hold almost 4 quarts of oil, my 450x holds less than a quart. 650 makes a lot more sense until you get in the tricky stuff, then you want the light weight with electric start.
How about a 500lb bike loaded with another 100 lbs in the middle of baja.
The when you get where your going drop your tent for the night.