This information comes from The Axis History Forum:
The folowing was taken from 'German Miltary Transport of World War two', by John Milsom.
The earliest tank-transporter trailers, intorduced before the war, were in two load classes - designed specifically for carrying the PzKpfw I and II respectively. One of these had an 8-ton rating and the other a 10-ton rating.
The only tank-transporter trailer in common use thoughout the greater part of the war ws one of 22 to 23-ton capacity, although trailers of 45-tons and 60-tons capacity were developed and standardised - without, however, being encountered in the field. A few specimens of 68-ton trailer for the Tiger II tank were encountered.
The 8- and 10-ton types, both known as Sd.Ah.115, were low loading trailers having a single pair of twin wheels with pneumatic tyres at either end. The front axle was arranged for fifth-wheel steering and supported the raised front end of the platform through its loading position on the ground. Ramps could be inserted from the loading platform to the top of the raised front portion enabling the entire trailer to be used as a ramp for loading the tank on to a railway flat or heavy lorry of the Faun L.900 D567 type.The unladen weight of the trailer was 5-tons and the overall length 31 ft, the width 8 ft and the height (unladen) 4 ft 9 in. It was manufactured by Wagen-und Maschinen AG vorm. Busch of Bautzen.
The 22-ton tank-transporter trailer (Sd.Ah.116) - later rated to carry 23-tons - differed from the previous model in having the loading platform suspended between two bogies, each with two pairs of single pneumatic-tyred wheels. Both pairs of wheels on the front bogie steered fromthe draw-bar by means of an arrangement of tie-rods. There was a similar arrangement at the rear, where a light draw-bar was provided for handling the bogie when detached; but in addition, a steering wheel with a compressed-air servo mechanism was provided for the use of an operator required to look after the rear end of the vehicle during travel (the driver of the trailer had to demonstrate driving ability equivalent to that of a holder of a Class 2 driver's licence). For raising and lowering the platform, hand-operated winches were used on the earlier models and hydraulic jacks on the later ones. The draw-bar could be locked in the central position. The earlier models were provided with special ramps to enable them to be used for loading railway flats over the front end of the transporter. The unladen weight of the trailer was 11 3/4 -tons, the overall length 45 ft 6 in, the width 9 ft 9 in and overall height (unladen) 8 ft. It was built by Robert Schenk, Waggon-Fabrik, Stuttgart-Feuerbach.
Photo comes from the same article mentioned in the text above.
Confirms the different shape for the construction of the triangle to the fifth wheel steering.