Actually, 1853 CCC is still not to bad in a TT that is the lightweight entry line of TT's for Grand Design. We recently bought and dearly love a GD Reflection 315RLTS and it had slightly less CCC than the Imagine 2950RL. However, like 9one1 wrote above, I pull mine with a Silverado 2500 and have plenty of cargo capacity in the truck if necessary.
In regards to the 2600RB and the low CCC,just be extra careful what you load in the TT. For dry camping (which we do not do) with a fresh tank capacity of 52 gal., a full tank would add nearly 400 lbs. of weight, which is 1/3 of its CCC.
Just be careful what you carry in the trailer or look for a model with more CCC,