Depends on how wide your rims are, my ones are 8J & 8 1/2J - there are various online calculators that work this out for you.
Rack: search retro roof racks on this form a member makes and sells them, not cheap, around ÂŁ200, quite heavy around 30Kg
Yes quite a high ride and step up into the van now.
But I'm happy with the result. Cheers everyone