We can't block access to their propane tanks. That's the issue.
I just told two chimney sweepers not to drive a 2 ton machine on our property and don't park where these two idiots created a second driveway using our land.
How far from the common roadway are their tanks?
Again - a propane driver can drag hose 150’ easily I believe - your not blocking access - your restricting it to a reasonable degree.
The best example I can think of here is that of the split of mineral rights and surface rights. If you live in an area like I do where gas well drilling is common - it’s a continued matter before the courts. Basically - courts have argued both parties have the right of enjoyment of the use of their property/interest SO LONG AS IT DOES NOT INTERFERE WITH ANOTHERS.
So I have the right to build and do what I want with my land (the surface) - but cannot stop someone who owns minerals 10k feet below the ground from reasonably accessing them. Likewise - the mineral owner has a right to reasonably access - but they can’t tear up my yard if there is an alternative access point/method that wouldn’t cause as much of an issue. If they could drill a small 1” access well to remove their interest - they cannot come out with a giant earthmover and just start ripping the shit out of things because they want to be spiteful.
You have a right of reasonable enjoyment and use. Their rights don’t supersede yours - they just need to be balanced and considered in your restrictions.