Beat me to it S&R
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Megan, the best solution is for the front crew to be on NVG and have a radar picture on an MFD and for the rearcrew to monitor radar and FLIR on their screen - that way all the bases are covered and with some overlap.
FLIR is excellent but relies on thermal contrast to detect things - it doesn't work in fog or cloud and rain degrades the picture too (the moisture tends to attenuate much of the thermal energy and greatly reduces contrast.) You also get periods of thermal washout/crossover when the background is radiating the same energy as objects in the foreground.