I have two types of vehicles, forklifts and straddle carriers,
there are also 2 choices of scheduling methods,

I want to be able to have
forklift_schedulemethod1
and forklift_schedulemethod2

and

straddle_Carrier_Schedulemethod1
and straddle_Carrier_schedulemethod2

The question is,
From a design point of view. Is it best to have

forklift_schedulemethod1->forklift->vehicle
and
forklift_schedulemethod2->forklift->vehicle

(where -> means inherits from...)

or should I have it

forklift->schedulemethod1->vehicle
forklift->schedulemethod2->vehicle

bearing in mind that I also have the
straddle carriers too???