When mine was a Parafield, I just had a 200 litre drum on a 6x4 trailer with hand pump. Only my aircraft was using it, so no need to meter.
A friend just built this rig, soon to be commissioned at Gawler:
If you run your own school or club, certainly not expensive to do. I think this has about $2500 spent on it.
More and more RA-friendly fields are seeing the light, the major issue being the AVGAS bowser is usually owned and operated by a 3rd party fuel supplier. Many clubs and schools need to get over the fear of taking on the task of being a fuel merchant themselves. Even if you barely break even, there should be plenty of flow-on business.
Build it and they will come!