Some folks just launch an empty boat at the dam, do the 7 mile day float to Little Hole and load the gear there. Little Hole has lots of room, lots of ramps and lots of parking.
The John Jarvie Historic site on the B section is a fun stop. You can float right up to a little historic park with some early homesteader buildings, a water wheel and a small museum. The fly fishing on the A section is legendary, as are the crowds that come to enjoy it. There will be a lot of drift boats fishing the A section but they really thin out after 12:00 noon. Wade fisherman will be in the river all day long for most of the last 5 miles of the A section. Things thin out a lot below Little Hole. Flaming Gorge Lodge rents rafts and is a good source for parts and missing gear. They also provide shuttle services, including a 'trailer launch' service. The drive out of the C section is long and tough, so the shuttle is pricey.