I imagine that you could make the tow bar exactly the same length as a single jet ski trailer. Picture the watercraft loaded exactly the same as normal, however at the back of the tow bar (trailer) it would be connected to the vehicle being towed by the RV. As far as launching it if you had an axle under your "tow bar" you could drop it to the ground and then hook it up to your vehicle that you towed with your RV and then launch it as normal. Granted it might be kind of difficult to drop to the ground when you get to the destination and convert your tow bar to back to a jet ski trailer mode.