Squeaks i would just run off your 20# cylinder to get you by. If you have a male fitting going into ur 100# its a pol fitting. No big deal it just screws into the interior of your valve and is actually a better hassle free hookup. You are used to BBQ grills that have a plastic QCC which screw onto the outside of the valve. They are easier but also have safety valves in them that can become issues at times.
If it were me personally i would just take those 100# and run into Roberts Oxygen in Pleasant Gap and exchange them for filled ones.
I've been using Heller's for 10 years. They've been consistently reliable and will match or beat other companies low price offers. Tank rental is figured into the price per gallon you pay, not a seperate cost like some companies charge.
I believe they have a branch office out your way.
All that is necessary for the triumph of evil is that good men do nothing. Edmund Burke
Look into suburban and look into getting a bigger tank.
We use to run off 2 100 lb tanks then switched to a 500 gallon tank.
Costly to fill but we reorder at 40 percent capacity which leaves us with plenty of fuel if such a delay with delivery comes up.
One other thing there is usually a tank rental charge for one that size.
Joe check out Rich Gas out of Kane and compare the price to Williams you may be surprised in the price difference
I heat and cook with propane at camp. My supplier is ameriagas. A buddy and I compared bills and mine was 1 dollar a gallon more. I called and they said it was tank rental charge. I ask them to remove both tanks when they were empty. They sang a differnt song and gave me the $1.00 off per gallon on the next fill up of 2 400 lbers.