Yes, weight the front/rear, but also look at the tires. There is a huge range expecially with SRWs. Some single tires can exceed the axle rating if you use 19.5s. Otherwise, use 18s or others that can still be as high as 4080 each.
As far as Center of Gravity is concerned, I don’t think it’s worth a consideration since all short bed camper manufacturers plan for their TC to be on a short bed. And ... you can’t change it other than minorly by shifting items in your TC. All else being equal, more weight forward is better since almost no TC puts hardly any weight on the front axle.
Finally, there’s the legal consideration. If you are going there, you are simply limited by what the sticker says.
My post is abbreviated. If you are gluton for punishment watch your thread for a few days, or simply search recent posts or the archives. :D