Use the GVWR and 12& for wet tongue wet.....if that exceeds your trucks capacity then too much trailer
as a side note....traveling W/O fresh water IMHO is NOT a good idea
What if you can't get water at/near distination....bad water/water line broken, no water available for numerous reasons.
We always travel with FULL fresh water tank
Trucks towing capability should be able to handle the weight of water, propane etc PLUS your stuff.
If NOT...too much trailer/too little of truck
Besides.....with properly matched truck/trailer weights towing is more enjoyable so more camping trips are done!!!
