Tech Manual, pg 126
Is it legal to install multiple engines on the same vehicle? One drive train/movement mode, but two engines driving it (always one or the other, of course). In particular, I was thinking of two scenarios:
1) a solar vehicle with a fuel cell or electric battery backup (same MP, two engines)
2) a vehicle with two different movement factors, such as an ICE vehicle with environmental sealing that switches to low-performing battery power when in vacuum.
I don't see anything in either page 126 or the Weapons and Heavy Equipment entries that would forbid this for support vehicles, but it also doesn't raise the possibility, either.