I'm not sure how GM gets to the 26k weight rating, mine is 19500 according to the sticker on the door, 26000 for trailering.
depends on the GWVR option - they go up to 26k and thats not trailering
I believe this is a mistake. I have never seen a GM 5500 4x4 with a rating over 19,500 lbs.
The OP is looking for a truck comparable to the F-550 4x4. The GM 5500 4x4, which has a typically available GVWR of 19,500 lbs, sticks out like sore thumb as a direct competitor to the F-550 4x4. Even if it DID go up to 26K lbs, I believe this only begs for the overwhelming coup de gras on the F-550 4x4 in that it's comparably priced and capable of carrying more weight than the little F-550 4x4.