im a low loader driver... my advice would be dont be thinkin you can pass your test and get onto a 150tonner..
if someone is on the lookout for a driver, theres not a chance they will take on someone with no experiance of operating plant and first time with a low loader.
you'll have to start from the bottom poss a 7.5tonner for a plant hire firm and work your way up to 17t - 32t rigid then they may let you loose on the bigger stuff.