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Some farm tractors that have small wheels in the front and larger wheels in the back is to help farmers pull larger equipment. The large tires have more traction and the smaller wheels help to steer.
technicaly speaking there is no need for a caster angle on your rear wheels, this angle is set in to the front wheels to aid self centering of the steering, like on a shopping trolley wheel. unless your rear wheels are steered or damaged in some way there is not usually a way to adjust this angle.
Sports car's have powerful engines . So if the engine it attached to the front wheels then front wheel's would have to the acceleration as well as the steering which would spoil the handling especially during turning fast (the reason front engine car screech during turing fast). Now putting the engine at the back and connecting it to the rear wheels , the rear wheels would do the job of accelerating , and the front wheels would be free to do the steering part .
There are several car models that feature 4 wheel steering. The advantage is more control in the turns, tighter turning radius, reduced tire wear. One example is GMC Quadrasteer. The front wheels are steered normally with a rack and pinion or some other common steering set up. The rear wheels are steered with computer controlled hydraulic rams.
When you have to stop suddenly, or as an emergency, It is important to keep firm and constant pressure on the brake pedal while stopping. Rear-wheel-only appears on some light trucks. It prevents the rear wheels from locking up so that the back end of the vehicle does not skid sideways. The front wheels can still lock up and the driver will lose steering control if this happens.
In most instances both rear wheels. However some older cars only lock 1 rear wheel.
Some - but not all - do. Rear loaders and front loaders typically don't; barrel loaders and side loaders set up to load on the curb side typically will.
Sledges pulled by dogs, skis, snowmobiles, and snow tractors of various kinds- some with caterpillar tracks and some with extra-big wheels.
BMW 3 series cars have 4 wheels. Some also have a spare wheel. Most of them have a steering wheel too :)
Power steering can also be engineered to provide some artificial feedback of forces acting on the steered wheels
Most semi trailers have 8 wheels, some have 12. The tractors almost all have 10 wheels but some of them have 14.
Steering wheel placement aims to put the driver closer to the middle of the road. Some countries decided differently WRT which side of the road to drive on. Cars made to be used in right-side-traffic have the steering wheels to the left, while cars made to be used in left side traffic have the steering wheel to the right.