I hear you, our neighbor has a Burb with the 8.1 and it is one powerful beast. We have lots of new homes being built in our area and one of the local contractors had one of their back-hoe tractors fail while clearing out a empty lot nearby, they had a newer Ford 3500 4x4 and were trying to pull it out of the thick mud it was stuck in.
My neighbor and I watched from his backyard as they could not accomplish this task, a bit of a braggart he turned to me and stated his Burb could haul it out easily. Sure enough he walked over and offered his assistance to the work crew there, they shrugged their shoulders saying okay although the look on their faces was of uncertainty.
He returned to his house where he fired up his seldom used 8.1 liter Burb, he maneuvered around the corner through the mud positioning his beast in front of the back-hoe. I could see the faces of the work crew thinking this old relic had zero chance of doing the task, lo and behold they watched in amazement as the Burb made easy work of it.
I have no doubt your Burb with 8.1 easily hauled your very large TT, having the space for your kids on long trips is truly priceless. I hope that you get many years of service from your Burb, I have a Silverado with 6.0 and it has been bulletproof although it can get pretty thirsty hauling our 33' TT, we have the 4.10 which helps in the mountains where we RV most.