When I ran propane in an old Landcruiser, I invested in a propane motor fuel directory, at the time there was a western and eastern US volume. There are usually quite a few stations (or there were at that time - late '80s, early '90s), but the tricky part is most were 8-5 M-F type of places. So for weekend trips, you had to plan things out. I ran 50 gallons of tanks, so could go ~500 miles between fillups.My dad has run his '72 Chevy pickup on propane since '74 and he runs a 100 gal. tank and had never had problems finding fuel, even on cross-country trips. Back east one time he did have some issues with certain tunnels he could not use. BTW, that truck still has the original engine and aside from one broken timing chain, it is all original w/ maybe 700K miles on it by now (that is the biggest benefit of LPG, it burns very clean).

Smog restritions is what ended up causing me to get rid of my propane powered vehicle in CA. They dropped the LPG exemption back in the early '90s (only diesel and electric are exempt now) and made it nearly impossible to get a non-factory equipped vehicle smogged, that I gave up and sold it out of state. Funny thing is that LPG burns much cleaner than gasoline, so passing the sniffer test was easy, the visual is where I failed.