Here are just a few reasons:
No problem, it is perfectly OK to drive your boat on to the trailer with the engine as long as there is enough clearance to keep the prop from hitting anything or anyone. I used to do it all the time. As soon as you start to feel resistance from the hull resting on the trailer skids stop and use the winch the rest of the way.
The wash from the prop causes a buildup of silt and rocks that piles up behind the motor. Other boats drive over this and it can damage props, or scrape hulls. The silt is washed out from below the ramp, which then causes a hazard for trailers which can back into the washed out hole and get stuck. Many states actually have laws against powering a boat onto a trailer. Read a boating safety course for more information...
jet drive
because when the engine pushes the boat, chances are you'll expose the prop to air while its still moving. which will ruin the engine.
because when the engine pushes the boat, chances are you'll expose the prop to air while its still moving. which will ruin the engine.
If it has an engine and you can drive it, yes. If not (ie you have to tow it) then no, it is a trailer.
As evenly as possible between the drive and trailer axles.
Jet drives are used commonly for boats designed for shallow water conditions. Jet boats can have inboard or outboard jet drives.
This could damage the engine.
9.8% drive boats, but travelers often transport their boats across seas
Over the drive wheels
If your on the the throttle while trying to get on the trailer, you will make a ditch where your prop was propelling. so if everyone does this, next time u back your trailer in, your tires might get stuck in that ditch, and that would suck