Took my 2013 Plus 4 on Brittany Ferries last year and no problems at all however would suggest following others advice about accessing ramps at an angle rather than straight on. I also find breathing in helps for some reason……

Andrew
2013 Plus 4 ‘Alice’
2014 Plus 4 ‘Margot’ prev
2004 4/4 prev
1981 4/4 4 seater prev