We came to the same point of not wanting to carry a 2nd 20# bottle. For me space is a problem and I really don't like slinging that heavy bottle in and out of the truck.
One of my camping buds got a 5# bottle for his grill/griddle. It is the perfect compromise and now everyone in our camping circle has one.
I refill ours once or twice/yr and its size and weight make it very easy to manage. I pay less than $4 to refill it at tractor supply--that is some serious economy considering the price of the 1# bottles.
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