Bob, you might have better luck with your questions if you show some sign you've done a bit of research first. Lots of people ask the same questions, and a certain weariness sets in about giving the same answers over and over. Besides, the more specific your questions, the better answers you'll attract. "Any tips....." is pretty general.
For example, there are some important limits to tourist visas and the visa waiver program, which will indeed be crucial to know beforehand. Maybe read https://travel.state.gov/content/tra...r-program.html. There are some things you might want to know about shipping, easily found by doing a site search on The HUBB--this has been discussed at great length.
No one's going to care whether your speedometer works. I'd be sure to maintain a full set of lights, carry a current license and insurance, and to keep within 8 mph of all speed limits.
You'll want to think carefully about seasonal issues; lots of mountain roads won't be open in mid-May, and national park campgrounds will often be closed, too. Again, "up and around the Rockies" is sort've vague, since the Rockies extend 5000 km from New Mexico all the way up to near the Yukon Territory, and there are other ranges (and other landscapes) which are (IMHO) prettier and more fun, at least until you get to Banff and Jasper.
Hope that's helpful.
Mark
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