Here's a Class A on the Washington Island Ferry at the end of Door County, WI (Lake Michigan), taken from the ferry going the other way. We were getting seasick on our ferry. I'd say the waves were at least 3 ft high, although it's a bit hard to tell from the pic. This is August 1986.
1988 Coleman Sequoia - popup (1987-2009)
2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10