Depends - Had it before on some rigs and it would take at least an hour and a drive across town. So no real time savings. This dealership is a nice new facility with a dedicated lube area - so it may be fine. Although like any busy big dealership the cars and trucks are packed on the lot and always rigs in motion. Leaving the possibility for mishap.
Had another dealership's dedicated quick lube do the Duramax for a year. Then when I went to do my first oil change, it was plain to see they did not get at the hard to reach zerks (there are 11 zerks on a 2500's front suspension). And the transfer case was low - never checked - these trucks are known for vanishing transfer case fluid.
Time wise does take longer at home true, dealing with no lift. But I am not about over maintaining it to the decades old 3 month or 3,000 mile mantra. To convince myself it was OK to let the OLM tell you when to change oil, I ran the Duramax 10,000 miles in 10 months until the OLM said to change it, and had the oil tested and it was fine. After that I always went either 1 year or when the OLM said to.
The diesel truck got me looking into the quality of oil filters too - returned a bunch of Fram I had just bought for other rigs after that. And those of you using AC Delco filters look into it - clearly not the best either micron wise.......
I use Mobil 1 filters or K & N.