I can't compare, other than a generalized "our previous diesels (1 each of the Big Three) outpulled my Silverado" - but our 5.3 V8 got about 11.4 mph pulling our (small!) #4500 20' TT on a recent trip. We ran around 65 mph on relatively flat expressways. Ed got around 13+ mpgs pulling our car hauler with a large SUV loaded (around #5000) but that's much more aerodynamic than a TT....LOL!
Our previous diesels pulled our 30' 5th wheel like it wasn't there. Going up mountain highways, it just boosted the turbo a little bit - if the truck actually downshifted, Ed and I would laugh and say "Oooh - steep!" The 5.3 downshifts a lot, and generally runs over 2000 rpms when in tow/haul mode - BUT: as my also "daily driver" - the Silverado is one sweet truck. We don't camp enough to justify the cost and extra maintenance of a diesel, nor does our trailer require it.
Deb
Ed, Deb, and 2 dogs
Looking for a small Class C!