I have never been in 4 to 5 footers so I can't help you out on that one.. But I have run a good bit in 2 footers and once or twice in 3 footers with my Gambler and I didn't have any problems.. But I know there is a big difference in 2 to 3 footers verses 4 to 5 footers... I would probably stay at home if I had to face waves that big...