VOSA always at M6 J31

lancs123:
I very often pass J31 of the M6 (Tickle Trout) and VOSA are nearly always parked Southbound just before the on slip. (Ford Galaxy)

Are they waiting to pull trucks into the checking area at the end of the M65 at Preston?

spot on thats exactly what they are doing been pulled twice there told me cause my lift axle was up (so what?) take you onto weighbridge at end of 65 both times just a quick weigh then away waste of time really