Hello Tony,
I'm sorry I have no experience of teh make or model you mention, but I note you have a concern about the amount of current the units use.
Can I assure you that although movers (any make) can draw quite high currennts, when you actually work out how much total energy they draw from the battery (Ah) the results are quite low. To put it into perspective, you are likely to use more energy using a 12v strip light for one evening than you use when positioning your caravan.