Sounds like the 20lb tank would be a good investment, given the amount of travel, and the fact that it only takes a few 1lb tanks to take up as much storage space as one 20lb tank, yeah? But keep a 1lb as backup, as that Weber adapter hose that lets you use a 20lb tank can be finicky, and you'd need to be near enough to a HD/Lowe's or wherever to get a new one, I think.