Thanks for all the responses. Jefe reassured me to stick with what I have. I just stumbled upon the gasser dually and my mind got swirling about potential options.
I guess I do have my truck pretty dialed in. New tires this year too. I think you guys are right, and I should think about a cargo trailer, and I can even offset some weight from the camper into the trailer (camp chairs, water jug, BBQ which would normally be in the camper).
I also think that the gap would look funny. I wonder how noisy it would be?
I would have to baseline the truck again. I know when all my fluids have been done, need doing, when front end parts are due to break again, ball joints. I suppose as an extreme, I could always bump up to 19.5's and suffer with the unloaded ride.
It is indeed a Quad cab. The kids stuff into the back just fine. It'll be fine for many more years, they're just 2.5 and 0.25 years old. They won't help make truck payments, so they'll have to live with the smaller back seat.
I was thinking boat for when they're in the 6 & 4 range, so maybe by then, megacabs will be cheaper.
Upon more research, I am a little leary of the conversion kits, the spacer kits. Seems to be mixed results. If I were to do anything, it would be a full axle swap. Again, in the quick research I did, everything is the same on Gen3 rams. Rear brakes are the same, axle housings etc. It would be rather straight forward. By then my truck would be 18 years old and not worth much anyways! Who cares about resale!!