Yes
Only if cheap
Only if (something else)
No
Not even interested
Stockade was inspired by the Cadillac Escalade, but he's not actually a licensed replica. There is no trademark or copyright information on his packaging, and he is referred to as just an SUV.
While there were no licensed Cadillac toys from any of the movies, seeing as Cadillac is part of General Motors, licensing was likely not a problem.