On the spare, no. The system operates at ~1000psi, that is only when held on the stops, bound up and most of the time only a fraction of that. The new hose we used is rated for 5000psi full time, the Toyota hose likely more, has steel braid.
The chance of catastrophic failure is extremely remote. The most often seen failure is a leak, can often be trail repaired, slowed, with hose, duct tape, hose clamps, etc, even this is very rare. In the event of a catastrophic failure, the repair mode is; remove the belt and drive with manual steering. I don't remember ever seeing a pressure side hose failure on the trail and only a couple total, ever. Much more likely to need a spare motor, clutch, etc.