We have the same awning
as Frank and have enjoyed it LOTS! Our simple solution to no-marks is to utilize two gardening-knee pads under the two corners at front/back of awning. Simple and easy to setup/down.
Some pics of ours in action (most of the info was originally posted at our build thread in _this post
the full meal deal... bed/bath & entertainment
Here is a shot from the curb side showing the two vertical poles and guy lines (2 for each pole in this case...it was windy!)
here is what it looks like up inside (the canopy peak is ~2ft above sides)
this one from the rear showing how i have the lines going through a garden knee pad (which i place under the awning poles to protect roof) and then the lines going to the bumper in two places:
this one from the front showing how i have the lines going through a garden knee pad (which i place under the awning poles to protect roof) and then the lines going to the front A frame in two places:
here is a closeup of how the awning wraps over roof and fabric-edge is located at the inner edge of Parkliner's anti-trolley roof. This actually came in handy in the moderate winds as this edge was lifted off roof and bled excess wind caught under canopy:
That should give you a good feel for the utility of this particular awning.
PS...the only thing i would change is to get two green knee pads to match the awning color! (recalling my wife's reaction to the blue i purchased).