ive just bought a t4 with a full camper conversion,it has the 1.9 td in it,its reliable but not the quickest and hence its not as economical as the 2.5,service history is a must,particularly the usual cam belt and water pump also on the 2.5,they are good for 2-300 k if looked after but he 2.5 is dearer to buy,i love mine now,lot different than the vr obviously but its a camper