I've had a lot of battery problems over the last few years. Been through 2 batteries in 19 months.
I ran the battery down doing one road where I hardly move all day, and because the pump is wired to the van battery I was stuck so I asked a custy for a jump start (embarrassed) so decided to get it sorted once and for all.
Went down to my usual tyre and battery place and this guy was there who has just rewired his camper van and said that I needed to have a leisure battery installed and offered to do it. So he rewired it all, split relay under the passenger seat and put the leisure battery in the same place.
Had it done 2 1/2 months ago and only go on a long journey once a week (60 miles round trip) the rest is within a 2 mile radius. No probs what's so ever.
Hopefully will last a while now.... Keep you posted!
Cheers Chez