Using Sketchup 2015 for exporting an "animation set", I have encountered a pixel resolution limitation of 3840x2160. In previous versions of Sketchup, I was able to export animation sets with the same parameters available for exporting a 2D Graphic, which would be 9999x5653.
When doing a finished animation, I routinely render at 3 or 4 times the desired resolution and then size the images down to a usable size such as 1920 x 1080. This process is essentially a poor man's anti aliasing.
It would be great to have the full resolution capacity back in the Export> Animation> Image set routine!!!