Having only a scissor jack and wanting to avoid scrapped knuckles, I thought I would invest in a bottle jack for the van. Which do you suggest ? What tonnage do you recommend ? 3 tonne ? Needs to fit under a bus with a flat tyre and sit on a 1" lump of wood with (preferably) another 1" lump of wood on top. Bus is standard ride height. Yours thoughts would be appreciated.