About a 35T from memory; not big enough I suspect- The other issue is that, by this time of year many of the yards have full hardstanding, and no room to move the truck, even if you get permission to use a third party crane.how big is that crane at Henley ? as private boatyard they just might entertain a hired in crane.
That draft is a big lump for the upper reaches, I've done most of it with six foot draft, but that was a few years now, and I don't want to start that dredging row again!
For a fixed crane Caversham is the best bet, absolutely no doubt.
For yards that might let you hire in try Harleyford, that puts you a day further downstream or, and I have no idea if they would play ball try Bates Wharf - about thirty minutes from here yo want to end up?