I have a 6 lb cylinder that I bought years ago for 3 day canoe trips when we used to carry our camping gear with us Downriver. Later I bought an 11 lb cylinder to use with a tabletop Grill on weekend Campground trips. Between the two I have enough versatility, to run a tabletop Grill, on-demand water heater and Camp Chef type oven.
I don't have to worry about how much propane I use off the trailer cylinders since most of my camping has been in spring, late fall or early winter when I needed to run the heater. They are light enough to handle easily. They were purchased when they were relatively inexpensive. Nowadays they each one individually cost more than 20 lb cylinders. I have gotten the six pound cylinder recertified once when I had to change out the valve to the new type.
If you would be okay with getting a 20-pounder why not. If you can afford it you might even think about an 11 lb cylinder. You could even use it as a backup cylinder if the ones on the trailer run out like I did once in the middle of the night on the last night I was camping during the Christmas holidays.
