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I sure can't see any reason they have to be on a scale and I suspect the reason you see most folks just taking the tank to fill is they don't want to take their rig. Where I most often get filled, there is really no way to even get my rig next to the fill station, at least not without a great deal of jockeying it around to get it close enough.
In the olden days though, it sure was possible to get an overfill when the operator didn't know what they were doing. I remember one time the sun shined on one of my overfilled tanks and it vented propane in a huge cloud. No damage done, but I am glad a smoker wasn't walking by at the time!
You might call a propane delivery company or even go to a propane company that fills tanks like fork truck tanks and what not. They might be able to fill your tanks on your rig. I know when my Dad has his RV it had a 100 gallon tank on board and he had a company come out and fill his before he went on trips. -Jason
The local camper lot down the road from me (in PA) says they can fill the units without taking them out, but you will probably have to turn them some to hook them up. They said some of the bus conversions have 100 lb tanks that are permanently mounted like a fuel cell and have to be filled on board.
You might call a propane delivery company or even go to a propane company that fills tanks like fork truck tanks and what not. They might be able to fill your tanks on your rig. I know when my Dad has his RV it had a 100 gallon tank on board and he had a company come out and fill his before he went on trips. -Jason
Are you sure it's an RV?
Sounds more like a rocket ship with that much propane.
I know (at least here) that the attendant is supposed to visually verify the tank's condition (no rust/damage) and the date of manufacture (nothing over 10 years IIRC and they won't fill tanks without the OPD), and I had to remove the tanks from our slide-in camper to get them filled as I was told they cannot be filled in place. The place to look for the regulations would be whatever state agency is responsible for certifying pumps and scales. Here it is actually the state Dept. Of Agriculture that has authority over fuel dispensing pumps, not the DMV.
I found the people at tractor supply to be very helpful,I just pull into there lot with my truck and trailer,explain that I have a bad back and remove the tank cover,unscrew the tank tie down and unscrew the tanks pigtails. the attendant will remove ,fill and lift the tanks back onto my trailer,I the hook up the tanks,reinstall the tie down and put the cover back on.I ALWAYS put a $5 bill in the persons hand and thank them profusely.A little bit of being nice will go along way to getting the help that you need.I have had complete strangers help me just because most people will help if they see a need.I have also had tanks filled at a campgroung where I was staying,one place will even send someone to your site,remove the untethered tank,fill it and return it to the tank rake on my trailer