I've just seen this clever tool on Facebook - link below - looks as though it might work a treat on our vans - but it could also dissolve the whole bus !! https://www.facebook.com/TechExplorers/videos/522631014581329/
Looks great, once they lower the price as now they are somewhere between $240,000-300,000 to buy or $7500 for a weeks hire. seems a bit expensive unless you have unlimited funds.!