It has been mentioned in various threads that the 2014+ TC cannot be lifted on ramps because of low clearance below the front bumper assembly.
I was considering making my own ramps with a shallower angle, but came up with this solution instead.
This version is a little crude, made up of lumber I had on hand, but it works with my ramps, so I will assemble a more permanent version of it.
This system essentially changes the angle of the ramp by adding 2 layers of 2 X 10 under the front of the ramp (2 x 12 would be better). I suppose other brands of ramps might require some tweaking.
Of course, do all this at your own risk, on a flat and solid surface. Doing this also changes how the ramp sits when loaded, in such a way that it was not designed for, making it more tippy.