We have a 2013 Bounder 35K and my wife is also short.  We had an extender installed on our brake pedal.  The accelerator pedal was ok for her.  We went to an RV repair and service shop.  The install is basically a block of wood that was secured from the rear of the brake pedal, then wrapped with an adhesive backed sandpaper.  It has been on about 5 years and still works well.  My wife still uses pillows behind her back while driving but has no issue reaching the pedals.  It took me about 4 or 5 times using the higher brake pedal to mentally adjust to where it was, after that it was easy.

Overall, I'd absolutely do it again.  If you are handy, you might be able to do it yourself.  I was more comfortable having it done.