Solar on our Motorhome Van, but not sure which controller to get ? help please

[Rixsta]

Thanks I noticed them and that this company seem to sell them.

http://prismsolar.co.uk/shop/midnite-solar/dc-din-breaker.html

Looks good would the highest rated one do ?

Also a question for anyone who may know.
The MPPT Morningstar 60A wants grounding..would I just put a ground wire from its ground post to the van chassis ?