I am towing the GMC version, the Yukon XL.
I have towed it for 2 years with no problems, and no regrets.
On flat ground, I don't know it's there. In the mountains, I know it's there, as my hill climbing speed can drop as low as 40 MPH.
I have a 40' coach, 400HP, and 1200 Ft. Lb. of torque.
I don't recall anyone having a problem with length. MH's are not on the radar for length, as we are not DOT regulated.
Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, previously 4 years as a fulltimer in a '07 DSDP