Well, my 6.0 engine statistics won't help you, but I can say that when I weighed my TM 2720 it was 3380 pounds on the TM axle. I did not weigh the tongue, but would guess total weight at not more than 4,000 pounds. I had it loaded with every piece of camping gear I own and full of water, 40 + 6 gallons. I have no doubt that your 2619 will weigh less than 4,000 pounds as long as you don't have a rock collection.
It sounds like you will do fine.
fwiw, the very best mpg I have ever gotten in my crew cab was 15.5, running at 60-65 mph and no passengers or cargo. My nominal fuel consumption when empty is 13.5 and when I take DW and the TM I get between 9.5 and 11.5, depending on how I drive. Friday night is a little rushed and going up into the Sierras. Sundays coming home is more leisurely and downhill. Thus the difference.
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