Good point Martin.
However, these are all small ribs and assumed kept, transported and launched on a road trailer. Regardless of size will need to be launched with a vehicle as just the weight of trailer alone will generally proclude a hand launch.
Manhandling singlehandedly any of these very lightweight rigs off a roller trailer should be no problem. I consider my rib lightweight and can easily launch solo even though boat only weighs around 600kg.






