I have a 27K so a bit smaller than yours and usually have a toad or boat in tow and we live in SoCal. We regularly take Cajon Pass and I have not had any trouble with overheating, but then we don't do it at 75. I try and keep it within the best powerband rather than speed. I am okay slowing to 45 or 50 when climbing a steep grade so that I don't overstress things. I also have a scangauge so I know the temps rather than location on the gauge.
Like the above post, it would help to know how far above normal the needle went. Good luck and safe travels.
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This post is opinion based on experience.
2015 Hurricane 27K
2013 Sea Ray 220SD
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