Many of you correctly guessed yesterday's mystery vehicle - a mobile aid for horse training. It was the handiwork of Roush Technologies.

The project weighs in at four-tonnes and was commissioned by an overseas specialist in racehorse training equipment. Roush's design allows fitness monitoring of horses from walk, trot to full gallop, up to 60kph.

The cabin includes a centrally mounted driver’s seat, plus additional seating for a trainer and a veterinary specialist. Onboard systems include 12-volt and 240-volt electrical supplies, to power systems such as computerised heart, blood, oxygen and fitness monitoring.

Chassis and running gear comprise a complex, box-section, cross-braced frame, with suspension derived from a Ford F150 series truck. Power is provided by a Volvo 2.4litre, five-cylinder diesel engine, driving through a conventional automotive automatic gearbox. Final drive is delivered via hub reduction on the rear axle only.

Stickers are on the way to the first correct five emails received.