I have a similar application, a teardrop with limited roof space. I went a different route with a 185W high voltage (70+V) panel which required an MPPT controller feeding a 150AH AGM.
A PMW will work well and I recommend the MorningStar SunSaver and if you are contemplating adding, get the 20A version (about $75), and if SB did not include that see if you can trade up.
Parts of this equation are conservation in the form of LED lights etc. and battery monitoring i.e. a Trimetric or Vectron (I chose the Vectron)