I converted mine 18 months ago for a fraction of the cost.Remove screws from piano hinge fixing to sliding part of top,obtain piece of timber 50mm x 20mm x610mm long and fix vertical above the top of chest with top slid foward with 3 screws to front of ledge cutting out 2 pieces to miss brackets fixing unit to van.Then refix hinge to top new timber,all you need to do then is reposition magnet by 20mm by using piece of the timber as packing to lock sliding flap as this is now 20mm forward.I then stuck a small piece of thin felt underside of flap front egde with some dsa to allow flap to slide freely with weight of tv on it.We use it every time for meals now as there is only the two of us.The only thing you have to by 1.8 meter legth from bq for about £2-30 but this will do 3 vans so works out conversion for less thn 80p.