didnt know where to post this but ive rescently bought one secnd hand and ive used it a few times fine but yesterday and stilll now i cant get it down!!!it wont budge ive spent ages all arvo and evening and i cant get it down!!!when i first got it the lady showed me and i had trouble but once worked it out was fine but here i am stuck again!I had to try jam it in my boot open!!!i love everything else about it,one other thing is there a way to get the wheels from swivling it seems hard to turn?Thanks!!