"Safety" is more a matter of properly maintaining your truck, and driving like there's something inside your skull besides salt water taffy. Do you run the tires until the belts are visible? Do you tend to keep trucks until the frames are rusted down paper thin? Those kinds of things are what make a truck "unsafe" not putting too heavy of a camper on.
The average driver know something is wrong right away if the rig is unsafe to drive, and will immediately turn around and go home to correct the issue.
Your two main concerns will be with COMFORT and LONGEVITY. Will you like driving the truck? Only you can answer that, and then only after you've plunked down the money and it's too late to do anything about it without incurring monetary losses. How long will the truck last overloaded as it is? Only time will tell, but for sure exceeding the GVWR even with the best bolt-on prop-ups money can buy does shorten the life of the truck.
From there it all boils down to money. Spend it now, or spend it later. Maybe more now means less later, or maybe it's the other way around? You won't know until it's too late to change your mind.
Will you be safe? Undoubtedly. Will you be HAPPY? That remains to be seen. All we know is putting trucks and campers together that are suited for each other on paper, rather than trying to force a combination to work, gives you a much better shot of being happy with your decisions in the long term.