I had a receiver box welded onto the frame of one of my vans.
Worked great for pushing the boat down a narrow driveway, etc.
The hitch and weld shop that put it on gave me the option of putting it on dead center or off to the passenger side enough so that when backing, the driver would be looking right down the one side of the trailer so as to be able to better place it exactly into a close quarter garage.
I think most folks would want it centered, as it would fit into a narrower driveway and have adequate visibility to fit it into most narrow spaces, but he did have a point that you would be able to see the one side better if that fit your particular needs.
We had folks in our sailing fleet that used the front hitch to launch and retrieve the boat with, too, but with the motor up front, you can only go so deep into the water, and this may not be suitable for larger boats, unless you had an extendable tongue trailer.
The front hitch would keep the rear wheels dry on a rear wheel drive vehicle, which would be an advantage, but a four wheel drive vehicle in low range would be a better solution any day.
(I can launch and retrieve in conventional rear hitch mode my 8,500 lb Sea Ray on a tripe axle trailer with sand on the top of a steep asphalt ramp with my Durango in low range, and the boat alone is 1,000 lbs over the vehicle's tow rating without the 1,300 lb. aluminum trailer. M + S oversize tires help, too.)
I wonder how large a boat could be launched with the old clamp on bumper hitch from J C Whitney for $24.95? :wink:
Joe. :teeth :thup