I bought a 19 ft 74 Sanger ski hydro (medium hull) 2 years ago (4 seater, hot 468 Chev, dual 750's, inboard rod steering). Use it for skiing, hydro sliding, tubing and going fast. Turns ok when going slow, needs wider are when going fast.Use it on the delta, Folsom, CFW, Eagle Lake . Leave it in the water overnite (3 bilge pumps). Harly ever takes water over the sides. Have had a '68 Schida flat since '68 and love them both.
A month ago there was a guy selling a 1980 ( i think ) Sanger ski hydro for a thousand bucks in San Jose, CA
it was just painted primer casale v- drive is out. nice trailer. Let me know if you want to get the number for you.