If you want the relief valves to function as you want them to, they would have to be adjustable relief valves, and then you could set the relief pressure according to the max load you wanted to lift with out the PT pucker. At one time, I didn't know if my relief valves were working, so I sent them to PT and they tested them. and said they were working correctly. They told me the pressure that they were supposed to relieve, but that was awhile back. A good hyd shop can set you up with adjustable relief valves if that is what you want. and install pressure test fittings at specific locations. I have several test fittings on mine, and can plug a gage in at different spots, and monitor the system pressure. It is very easy to do. You just install a hyd tee in line with what you want to monitor, and add a quick disconnect. Some quick disconnects can connect under pressure, and others will not. I tend to leave the gage in one of the spots, so I don't have to take the time to look for the gage.