Help! Is a 4.57 rear gear tolerable?

[oem4me]

Hey guys, Im seriously thinking of buying (real soon) a new to me C-20 truck equipped with the Detriot locker 4.57 rear end, and I want to do a fair amount of highway cruising pulling an old boat and/or trailer. Problem is, I once had a 4.56 rear in my current '62 C-20 and hated it. That gear was totally useless for me. Of course, that truck has a little 235 six and three speed trans. The new truck has the 327 V8 and turbo 400 trans.
The seller claims with 31" tall tires installed it's totally fine at 65mph. I have confidence that this is his honest opinion, but I want to hear from those who have this rear end or made do with their low gears. Also, anything else I need to know about detroit locker in particular? Thanks ahead of time for quick responses!