Solar Ststem Sizing...

Wonder if anyone could help me 'size' a solar set up for my Landcruiser to run a fridge and a freezer ?

My Deep cycle battery ( second ) is a Century N70T 75 amp Hours ..20 hrs..It has isolator switches and was installed by a competent electrical person who does this all the time..

Now I intend stretching the holiday to around 2 months and will be using a little Engel 21 litre as a freezer, and a 39 litre one as a cool/ fridge for salads etc !!...and we want to go to the Kimberleys June -July -August ( from Sydney) and stop wherever we wish...and have enough power to keep everything as it should be ..for a couple of days or so , ...without running the engine all day to keep up !
My sparky checked out my fridges consumption and when cold both draw approx 3.6 amps..in total.. when both running, less of course individually ..my man however admits he has no ideas/ experience with solar panels etc....and I have very little idea anyway !!!

Hopefully someone out there with experience can fill me in on what I should consider / buy in the line of suitable panel(s) a good controller, and a battery monitor ???... that will let me see the state of charge etc.of my battery .?? and do I need all these things ??
Wondering also what the difference is between an Amorphous, Polycrystalline and Monocrystalline panels is !!!..its all a bit of a mystery at the moment !