This trip sounds very much like the one we did last summer in a rented motorhome.  Not cheap, but extremely satisfying.  A couple of  things that the author does not mention that make this trip so well suited to RVing:  

(i) the Gaspé peninsula is sparsely populated, and punctuated by small towns and bucolic rural areas without many accommodations.  There are, however, many places to camp.  An RV with some bicycles is ideal; 

(ii)  Route 132 is basically a loop around the peninsula which you can close near Rimouski and avoid backtracking by driving through the Matapedia Valley.  Impossible to get lost, and for those of us not used to driving the big rigs, much less stressful to navigate since you are basically on the same road all the time as soon as you get East of Quebec City.  

This is a wonderful trip, popular with Quebeckers (the "Tour de la Gaspésie" has attained common bucket-list status) though not so well known, but worthy of discovery, by the rest of Canada.