So from that perspective, does this mean that out of the three, the travel trailer choice would be a safer tow choice?
Never had a 5th wheel before but my understanding is that they are far more stable when towing.
Fifth wheels are probably more stable when towing. A TT can be stable when using a premium hitch like ProPride or Hensley. But,
your issue is payload capacity. Many boats can have as little as 5 percent on the tongue so a 12,000 pound boat and a 12,000 pound TT is not the same both from wind resistance, side wind loads for sway considerations when big truck pass, and from hitch weight. I would opt for the TT unless you get a dually and you indicated that is not in the cards. You have more than enough engine with the Cummins, that is not an issue and the exhaust brake is excellent for safety down hills. From those two considerations you are gold.
For some reason Ram kept the GVWR on the megacab artifically low as it has the same running gear as the previous quad now crew cabs with higher gross weights. Last year the megacab's gross was increased but in previous years the megacab
dually 3500 had a gross of under 11,000 pounds; while the same truck in crew cab configuration was around 12,200. You might look into those numbers for your truck as it might make your decision real easy real quick. A 13,000 pound TT toyhauler could easily have a tongue weight of 1700 pounds and the hitch is at least another 100 pounds.
