What makes Rigs of Rods different to most simulators is its unique soft-body physics model: vehicles, machines, objects, etc. are simulated in real-time as flexible soft-body objects, giving the simulation an extremely accurate behavior which entirely depends on the physical construction of the vehicles or objects you create.
Truck?
Node and beam simulation with realistic handling and damage - check!
Train?
Accurate wheel and rail simulation with derailments on overspeed - also check!
Ship?
Buoyancy model based on elemental pressure gradients - you got it!
Aircraft?!
Advanced flight model based on blade element theory - this too!