What sort of experience can you bring to the party?
If you’ve only ever worked in a job that is totally unrelated & hope that throwing your £money at getting this type of job is going to work, then you are sadly mistaken. If however, you have previously worked alongside these trucks then you already have one foot on the ladder.
The point is, if you have worked alongside a tipper/grab . . . then you really should be asking them & not the internets !