Jeff,, Ya could run into a problem if you fully block off the return air side of the a/c,, but its larger than the supply side and if ya mount it up as high as you can in the foot well ya probably will be ok,,, If ya just cant get it up above the blankets ya might try and figure out a baffle that would assure air flow down to the intake,,,
My problem is I have no space for an a/c either in the galley, footwell or headboard area,,, Soooooooo I am trying to "Ignajgeer" another option,,
I might have come upon an idea but its still on scratch paper and I would loose the use of a second door during use,, that is when I get the second door cut in,,, Good luck with getting it worked out,, Summer is definately here,,,
Living large,,,travling small !!!
Serro Scotty rebuild(in progress)