I operate a 206 and just bought a 500 gallon trailer. I use 25 - 30 gallons per hour and count on 15 hours in the air before I have to tank the tank again.
I don't know what your aircraft burns per hour but I find that the convenience of having fuel on-site far outweighs the inconvenience of having to fly away for fuel, therefore, even if I had to go for a tank every other day, I would do it.
The 500 gallon tank is a nice size for towing and an easy tow for my Dodge Ram 1500.
Hope this helps.