The RAmpage Class of Offshore Support Tug designs were developed by Robert Allan Ltd. to address a perceived gap in the market for high-performance towing and anchor-handling tugs for critical offshore terminal and oil-field support duties. Filling a gap between a full Offshore Supply Vessel and a harbour/coastal tug, in the size range from 45 to 65 metres, RAmpage Class tugs are designed to be hard-working and reliable, able to maintain station in extreme ocean conditions, with enhanced manoeuvring and sea-keeping capabilities. With compact dimensions and high power, they are capable of performing the types of duties expected of vessels at both extremes of the spectrum used in this service, namely everything from ship-handling to ocean towing and bulk cargo supply, but with an emphasis on anchor-handling and terminal support/towing and cargo transfer duties.

The RAmpage Class tugs are classified initially according to their length, then by the type of propeller system; eg.

"Z" (for Z-drive) - for those situations where manoeuvring and positioning control is of paramount importance as in DP operations, or

"T" (for Twin-screw) - typically with nozzles and with lateral thrusters, offered for more conventional applications, especially where maximum Bollard Pull (BP) is required, and long-distance towing is more likely,

And finally by the type of powering system, either;

"–M" for Diesel-Mechanical, or

"–E" for Diesel-Electric propulsion.

Hence a typical vessel designation would be RAmpage 5000 Z-M for a diesel mechanical z-drive version.

The following RAmpage Class designs are currently available as fully developed designs, while other options are under development:

RAmpage 5000 Z-M
RAmpage 5000 T-M	under development
RAmpage 6000 Z-E	under development
RAmpage 6500 T-M	under development