Any tire shop will be able to do it for you with the boat on the trailer. They'll just use floor jacks instead of a lift. Work with one to get a tire you like. I'm sure you could also bring your own but that is part of their sales revenue so they'd likely charge you more for installation. Most tire shops stock trailer tires. I did my last set of Michelin's at the local Discount Tire. The previous owner put car tires on - they failed in spectacular fashion but that's another story.