Keep in mind if you go van mount that you loose the flexiblity to use your van for other things ,if thats the only use then fine go for van mount . I am keeping with trolly at present but my round isnt very big and its spread out .
Got to say its more prep time and messing with WFP , when you only do ladders and you finish for day your finished apart from maybe slinging scrims in wash .
WFP -have to replenish water supply, charge trolly battery, mess with 25l bins in and out of garage , mess getting van ready next day .
Having said all that its sooooooooooooooo much safer .
How much do you need to be earning for WFP ? Lots start with no round and build up part time , all depnds on your cash but i wouldnt like to be WFP and never done any TRad ,daft I know but i still like to be able to do it the old fashioned way if i get a house where WFP isnt an option .