Solar Setup

Hi all,
I currently run a waeco cf50, 100w panel and a crappy regulator. I'm about to upgrade to a cfx65 and would like to upgrade my regulator. I would also like to charge my 120ah battery from the alternator whilst driving.
Out system is independent of the car as we are rock climbers. We get to a camp site and place the fridge and battery under a tree and the solar panel in the sun and leave all day. Therefore leaving the fridge in the car is unsuitable as we need the panel out all day so it is only driving from home in Adelaide to the Grampians that the fridge is in the car but I'd like the ability to boost the battery charge from the car if we have long periods of cloud.
What are units like the redarc 1225 like as far as their solar regulator? Would this unit be able to be mounted adjacent to the deep cycle battery and connected to the solar panel and only plugged into a socket in the boot of the car for travel or when needed? Or would I be better off with a regulator like the Morningstar mppt 15amp, a good battery monitor and a seperator dc-dc charger in the car like a redarc 1220 or the projecta one?
Thanks

Benen