I like those Trail Boss trucks. What any truck should be at minimum in my book. Nice choice! Have a lot of fun with it. Are you out on The Cape in that pic?
What's next? I am guessing a 2500 series Silverado. Those old hard sided slide in campers are heavy enough you are probably very close to gvw in a truck Add your gear and clothes and water, and you could be at or well beyond the weight limit. I'm not saying that as any sort of regulatory body or to be a wet blanket, but to point out it'll make the truck very heavy in the sand, sag in the rear, tougher to handle and wear out parts sooner. The 1500 will struggle with that load whereas the 2500 will haul that camper around all day, every day and ask "please, sir, may I have another?" And it would just about carry the weight of two of those
@Terry Pickens mentions reworked rear leafs. I'm thinking you might go that route with stronger springs and make your half-ton into a modern "heavy half" and you might be OK.
CAN you carry it though? Probably. Check your truck documentation and door stickers. Some of them specifically state not to be used with slide ins.
Best of luck. Maybe I'll bump into you down The Cape