Boat will sit higher.. Outerbanks trailer has a tunnel between the bunks. I can only assume the bunks are installed much higher to clear the prop and shaft. But hull shape on the bunks might be ok, and nothing wrong with higher, if it tows ok.
Example of difference. I had to remove 2 feet of bunk on my Billfisher Aros trailer just to install a transducer this year. In other words, I couldn't have a 4" transducer hanging down without removing part of a bunk and cutting off the metal braces. So an Outerbanks with an inboard must be a tunnel. I had a smaller inboard diesel boat before my Blackman, and it sat high higher then my current Blackman which is an outdrive now.
If seller is serious, put your boat on it and tow it around the block and down the freeway a couple miles first.
Glenn (Wizard)
"The Reel One"
26' Billfisher