This flyon flyoff trailer was built by Amphibious Marine for the Vanguard 14.
2009 Vanguard Trailer $3500
The frame is hot dip galvanized. The deck is 14′ long and 7 feet wide. The axle is rated for 2200 lbs. 2″ inch reciever. Decking is pressure treated 3/4″ tongue and groove. The lighting is LED. The trailer is currently located in Texas.
Exploration awaits
The designer has taken 500 mile trips through the Puget Sound with an 18 hp version of this craft. You can read about the trip here. In fair conditions you can travel in open water between islands. Explore areas rarely seen by others such as river deltas, estuaries, mudflats, rivers during low water and high.
If you need a larger used hovercraft for sale then consider the Explorer 24×10 here.
If you want to build your own from scratch this Surveyor model is very similar.