My longest trip i've done was about 15,000 miles. And that number is right.
I started from out here in northern oregon went in the order of these cities.
Portland,OR - Seattle - Spokane - Cutbank,MT - Calgary - Rapid city, SD - Cheyenne,wy - Denver,Co - Salt lake City - Boise - Burns, OR - Denio,NV - Winnemucca,NV - Reno,NV - Sacramento, CA - San Fransisco,Ca - Los Angeles, Tiajuana down the coase to alcapoco, through mexico city up through meridia, (Say mayan ruins) up the mexican coast back up through Brownsville,Tx - Houston,tx - to Key west- Fl, Miami, fl - up the coast clear to portland, ME - bangor,Me and i squiggles a line across the country back to denver then saltlake city home.
I had with me at all times! 4 - 6 gallon gas cans (mexico is rough for that stuff just have to follow the taxies.
A sleepin bag rated for -40. Always a must.. to hot? just unzip it. But i'ld rather have more clearance for cold. -40 works lovely in 10* weather. Nice and toasty in the zuki.
I also took my head peice off the seat. Slid the seat all the way forward and reclined it down and it went flush with the back seat for a perfect bed for a shorty like me at 5' 8''. Have you guys done this? its a 4 door model.
I also had Water.. a must at all times no matter what. you never know when a hunter will think your a deer and shoot your radiator! (it has happened)
But road trips are the best things in my opinion. Just going driving so much to see. And nothing beats a suzuki at it. Good gas mileage.. and the capabilities of taking a shortcut are phenominal.