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 I agree with previous poster that you seem to have a fault somewhere. How long have you had the van and how old is it ? Has it always shown this problem ?

On a long run there should be plenty of opportunity for the leisure battery to be fully charged together with the starter batt. if all is working as it should.  I have 3 batteries on mine, 2 x starter and 1 x leisure and within a few miles they are all fully charged but then my batts are only 4 yeras old and in good condition. Your alternator is working OK if the starter battery is getting fully charged so the options are your leisure battery has expired or there is a problem in the electrics and the charge is not getting through to it. Do you have a large drain on the leisure battery somewhere which is stealing the current ? Hope you haven't left the fridge on !