Robert Allan Ltd. has designed numerous crewboats over the years, for either coastal transportation or oilfield support duties. Based on the best of these designs, Robert Allan Ltd. has developed a standard series of crewboat designs, designated as the RAlly Class.

The RAlly Class designs are intended for oilfield, coastal or offshore support duties. These robust designs are available in either aluminium or steel construction, depending upon speed and duty requirements. The majority of the designs feature large cargo decks.

Presently the Robert Allan Ltd. design portfolio contains the following crewboat designs:

RAlly 2000
RAlly 2500
RAlly 3000
RAlly 3200	under development
RAlly 3300
RAlly 3500	under development
RAlly 3600	under development