I put this on Reddit, but I'll put it here too;
I'm on the side of having more variety in vehicles, where it seems the majority prefers condensing their roles into a smaller number.
What would you give the Deliverer so that it has a place in the game apart from the Sunderer?
We could say the Deliverer can only be pulled with a tech plant connection and give it unique abilities that the Sunderer doesn't have. Less seats doesn't necessarily mean it's worse than the sundy.
The obvious upsides are reduced resources and a higher top speed/acceleration, better handling, etc. It's also amphibious (Hossin might have lakes? That'd be nice)
Possible abilities? It could be invisible to enemy radar when going under a certain speed. Less chance of detonating mines? Could be OP. Strong hill climbing ability? You could give anything unique abilities to give it a role.