Many people use dummyloads to ‘dump’ the RF power when testing their circuits. If you want to know how much power is dumped into the load you can measure this by switching a coupler in series. This will measure the forward and reflected power. Assuming the load is 50 ohm, the reflected power will be very low and therefore not of interest.
For my 70 cm setup (TS930 – MMT432/28 – LPM432/100) I had the need for a sequencer that generates the proper timing to switch all on/off in the correct order.