We have a 4-berth twin axle caravan which is similar in layout to the single axle however the extra length allows for a full-size rear bathroom and 6-foot front seats that can be used as two singles, ideal for a family. With an external length of just under 8m and internal length of approx. 6.5m this feels like a very large and comfortable caravan for the size. The MTPLM of this caravan is around 1650kg.