The history of the VW Camper van goes back to the end of the 2nd world war, when the British found themselves running the VW factory in Wolfsberg, Germany.
To ferry parts across the massive VW factory, stripped down Beetles were turned into "transporters". Ben Pon, a Dutch VW importer
, thought this was a great idea and in 1947 sketched his idea of a Beetle based van. Two years later it was launched at the Geneva Motor Show as the modern equivalent to the horse and cart.
The first VW camper van was born from this concept. This idea started life as a 170 cubic ft box, built over a four wheeled chassis. It was extremely simple and in the next 5 years VW would turn out 90 different body combinations - these included ice-cream vans, delivery vans, mobile milking machines, bread vans, milk floats, police wagons, fire engines, ambulances, pick ups and - of course - the camper van.
When the VW camper was released in the USA in the mid 1950's it sold in droves, with over 150,000 sold by 1963.
The Split Screen Bus
The split window model, or "splitty", was the first VW camper released. Today it is often considered the most desirable model and a mint splitty can fetch anything up to £25,000. 
Split screen buses were first produced in 1949 and continued on for the next 18 years. They were known unimaginably as the Type 2. The first Type 2 was called the Bulli and came in 2 models the Kombi and Panel van. The Microbus was introduced a year later in 1950. Splitties, Type 2, or Split Screen Volkwagen buses came in many guises; barndoor, panel van, kombi,minibus, standard, deluxe, barn door, ambulance, fire van, single cab pickup and double cab pickup,
Samba, with various options due to their age such as walk-through, double door, semaphore and safari to name but a few. However it is the Samba model that is the most desirable of all.
The VW Bay Window Camper Van
In 1967 the Split was replaced by the Bay (still known as a Type 2). Quite different to its predecessor, many felt that it had lost some of the character of the previous model. However, many refinements were added and its top speed was increased to 80 mph. It continued being produced in 1979. It was much improved on the split screen, offering a slightly larger body so could carry larger loads, larger and more powerful engines up to a 2 litre model towards the end of production, better electrics, a more refined and comfortable ride. However for many the bay window lacks the original design of the Splittie.
It is really the Bay Window bus that really accelerated the use of these unique vans as a mobile home or camper van. These vans were converted by various firms, such as Westfalia (also known as a Westy, Danbury, Devon, Dormobile and Viking. These firms offered different interior configurations for sleeping, cooking and storage as well
as differing elevating roof types. These ranged from small staight up vertical pop top roofs to front hinged, rear hinged and side hinged roofs, sleeping between 2 to 7 people!
The bay window made the VW a success and by 1975 the Hanover factory had turned out 4 Million of these vehicles. Not bad for a van that started life as a box on wheels.
VW believed in the Bus Camper with such conviction that they offered a Gold watch to any driver who managed to get their bay campers over 100,000 miles. This turned out to be a bad idea, as over 160,000 watches were given to drivers due to its continual reliability!
The T25, T4 and T5
In 1979 production ceased and the T25 replaced it, although even now the Bay is still manufactured in South America.
The T25 and subsequent T4 and T5 continued to bring the VW camper into the modern age. Whilst these later models may not (yet) have quite the iconic status of the Splitty and Bay, they remain massively successful, selling in huge numbers and still enjoying the same loyal following.