byrdnest6 wrote:
many years ago my son had a 3 wheeler and we would take it to Silverlake Sand Dunes with the motor home & jeep, I fabricated a very long tow bar to put the three wheeler on {a wheeless trailer}. It had a caster wheel under the ball so we could move it around when we got to the site. This worked great. This would work for your Seadoo. Looking at your trailer you could remove the axel, Weld brackets on the rear of the trailer to batch the blue OX brackets on the front of the Blazer. Bingo you have it.
If wishing to haul the seadoo mounted on top of the tow bar, build a new, much longer and heavier duty tow bar, to carry the seadoo.
Generally speaking, RV tow bars are not made to carry any tongue weight at all and seadoos are rather heavy. Also, seadoos are quite long and would never fit on the length of a typical RV tow bar.
How the seadoo would be launched into the lake from atop a tow bar with a towed vehicle behind it, is a completely other question that would require some creative thinking...