91's pretty much fixed because of the standards of emergency response.
It sounds like your 31 is carrying some USAR gear. The trailer in the photo carries confine space gear, tripod, some rope gear, some cribbing, a second set of HOH, ACROWS, a second tirfor etc. 31 itself is light RCR (including 330 cutters), vertical access gear, compressor & air hydraulic pump and finally a 3.5 kva gen set. The idea is that 31 & its trailer can do what 91 does but is 4x4 off road & carries confine space.
We also have a heavy storm trailer ( lessons learnt after the Renmark storm). Basically we can put two teams of equipment on the road, what ever the task. I am interested in the type of gear you guys carry on your 31 specially anything thats not standard kit. cheers