I know of at least one person on the vn750 yahoo forum who has made their own trailer like the one you posted the link to, and made their own hitch for the vn750. It wasn't the prettiest thing you ever saw, but it worked good for him.
You can get a hitch for the vn750 here:
http://www.motorcyclehitchusa.com/k.html
Also here is the writeup from another vn750 owner that made their own trailer.
-------- Original Message -------- Subject: [VN750] Re: Trailer towingDate: Sun, 17 Jul 2005 23:34:45 +0000From: doowriter123 <
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Towing is a reasonable way to bring along a relatively large volume of
items. I towed with a 750-4 Honda and GoldWings, and I never had
problems.
I made my trailer, it was 30"w x 39"l x 15"h. If you buy one it will probably have a hitch on it, probably a swivel type. I used a conventional 1 7/8" ball hitch and coupler, and could drag the pegs while towing. The ball of my hitch was mounted at about the height of the rear axel of the bike, but mounting it as low as possible will cause less wiggle when one tire hits a bump. Theoretically if it were mounted at the surface of the road, there would be no side movement.
I used 6" or 8" utilty wheels and tires, and ran 8-10 psi -- they acted as suspension, and never got as warm as the bike tires. I used Honda taillights mounted sideways so they shined on the license plate.
I once ran it at 100mph racing with a train across Nebraska - steady as at 70mph.