I have a 1.3 carry Pick up (New Shape) and at weekends I put a demountable camper onto it for trips away. When the engine is running i have a smart relay that transfers power through to a leisure battery in the camper that powers lights, Drinking water pump, 12v cigarette lighter socket etc. Is a larger alternator available that will fit to replace the existing / original to give more output and a better / quicker charge to the leisure battery ?