I don't know about the 2106TB, or what that would be. In honor of Covid-19 is Winnebago starting to name trailers after communicable diseases?
As to the Canyon, I agree with your restraint, but the numbers you need to focus on with the Canyon Duramax is the available payload and axle limits. My 2106DS pretty well maxes those out on my Colorado Duramax, with only about 200-300 left on each axle and for payload.
With relatively little water on board my front and rear truck axles were at 2920 and 2940 repectively, the the GCVW was 9820. The tow weight limit is illusory since my dry trailer weight is just under 4,000 pounds. There's no way I could possibly tow a 7,700 pound travel trailer and have enough tongue weight to avoid sway while being within the axle limits. It would be hard to even meet the tongue weight limit of 770 given that includes the weight distributing hitch.
That said, people do tow the 2108s, but they are likely even closer to the limits than I am.