All tanks have a band of metal on top of the tank that protects the valve. Crafted into the band itself are tabs punched out then bent over to make a hand hold. I like the ones with two "handles" instead of one handle. Much easier to pick up and move around. I like this so much so that a one-handle tank is a deal breaker for me and I don't have a problem handling the weight. That's how much more convenient having two hand holds is. Sometimes you have to pick it up high to set on the dock for the employee to fill it and that takes two hands unless you are a stud. I'm really handsome, but I'm not that strong.
A 30-pounder can be filled up any place a 20-pounder can be filled. Anything over 30 or if it is an unusual size then it's harder finding a place to fill it.
When you do the tank exchange thing, they aren't filled to the rim like Brim. This is an expensive route. I've never, ever had a problem finding a place to fill up a tank. But I have more than one tank, so if it is a Sunday in a small town, then I can wait several days to get if filled. If you have to get it filled right 'meow', you might have to pay a little extra. And maybe lose your favorite tank in one of those tank exchanges.
Steel tanks are much cheaper than aluminum tanks and when comparing the two full tanks, the weight difference is tiny.
It costs about $34 to put a new valve on an expired tank. If you find a damaged or expired tank, you can use it as an exchange to get a new tank at one of those tank exchange places. This isn't unethical. The companies want those damaged tanks. It's right on their websites. It's part of the service they provide.
Propane tanks do get stolen sometimes, so if you can secure them when they are out in the open, that's not a bad idea.
I use an automatic changeover valve. That way when it's 3:00 a.m., 20 below, and a tank runs out, I don't have to suffer. The heater has an uninterrupted flow of propane.
https://www.amazon.com/dp/B00V8JJGO...olid=1M88K8VCZV4ST&psc=0&ref_=lv_ov_lig_dp_it