We always top off our propane tank before taking any long trip. There is one caution though. If you have a TT or 5er that uses two small tanks, many propane dealers will charge you for the full capacity of the tank even though it may be half full when you get there!
The key is to ASK them about this before having them filled!
Good luck, happy trails, and God bless!
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD