The issue that I have is that the GVW is over 10000 lb.
is there any way that I can get that under 10000 lb?
OK, I'm going to go by what you typed, focusing in on GVW (Gross Vehicle Weight). So, the issue is the vehicle weighs more than 10000 pounds, and you need it to weigh less. You need to shed some weight. If you haven't seen the movie The Martian, I highly recommend it, as the last third of the movie is an excellent tutorial on how to get a vehicle to weigh less.
Now, on the other hand, and I'm just spitballin' here, if what you
meant to communicate is GVWR (Gross Vehicle Weight
Rating) and the vehicle is rated for more than 10000 pounds irrespective of the vehicle's actual weight at the moment, then the answer to your question is yes, there is a way to get that under 10000 pounds, but it's highly unlikely that you will be able to do so, as it is entirely dependent on a single factor, which xmudman touched on. That factor being, if Morgan replaced the original manufacturer's GVWR plate under the driver's seat with a new rating when they installed the box, they can (but are not likely to) replace that plate with a new one for you.
Sometimes upfitters will re-rate a vehicle, but if they do that without going through the manufacturer and having the vehicle VINed, they're on their own as far as vehicle sign-off and certification is concerned. Re-rating a vehicle is affected by emissions requirements, crash safety, brakes, or other Federal Motor Vehicle Safety Standards (FMVSS) requirements. Many factors must be considered. And that's why upfitters are so reticent to re-rate a vehicle without having it VINed through the manufacturer's Vehicle Special Order (VSO) department. Too many upfitters have found themselves on the wrong end of a legal proceeding regarding the FMVSS requirements.
Now, you could of course take the arguably Code of Conduct-violating advice (
Section 13) from Post #2, but I don't recommend it.