The Beagle is based on the Reliant Regal Supervan III. As a result of its one-wheel steering, the vehicle's all round average top speed and acceleration is hampered by its very poor steering, resulting in frequent understeer. The car's value is also below average with a base value of £300 (in mint condition), making it less attractive for vehicle export.
The Beagle 3 is considerably unusual in that it is depicted as a three wheeled car with a tricycle-like wheel configuration, making it the first and possibly only car in the franchise with three wheels.
The Beagle sometimes spawns with a roof-rack; other times it does not.
"Beagle" is a pun on the word "Regal".
The Reliant Regal Supervan on which the Beagle is based on is semi-iconic in British popular culture. For example, it appears in Mr. Bean as Bean's arch-enemy on the road. Perhaps most notably it is also the three-wheeler from which dodgy market trader Del Boy Trotter runs his enterprise Trotters Independent Traders (T.I.T.) in Only Fools and Horses, in which the vehicle was often mistaken for the admittedly similar Reliant Robin but was in fact the Supervan model.