I'll go check her out on Monday to see if there is any hull deformation.
There is some deformation, but not much. It's pretty minor and I doubt it will have much effect in the water. Nonetheless I've got the boat sitting flat on the ground now - perhaps it will un-deform over the next few weeks.
Much worse problem discovered. One of the wheels on the cart was destroyed. It is the standard cart with the skinny wheels with plastic spokes. Apparently the load was a bit askew and much more weight was on one side (plus I had most of the accessories lashed to the top -adding to the total weight), the plastic spokes deformed and then gave out, causing the wheel to fold under and the whole deal to list to the side.
So I'm looking for some small utility wheels that I can swap onto the axle. Shouldn't be too hard to find something. I'll look for solid tires again, since I typically launch from concrete and don't want the excess buoyancy of balloon tires.
And I'll definitely be investing in a couple of used tennis balls.