I have used a Halfords 4x4 2.5 tonne high lift jack for years. It is tall enough to lift the bus by pushing on the suspension tube even on ramps.. I think it goes to 520mm lift but is low enough to get under my lowered bus.(and modern car jacking points) I think it came with two decent axle stands for about £100 on a specal offer day.
Check out gumtree/Facebook marketplace.I bought an old commercial 3 tonne Jack, 2 axle stands and 2 Ramps for £40! I only wanted the Jack but it is heeeuuuuuge and very heavy, but lifts my westy with absolute ease
I have one of these LEHL jacks, it was gathering dust for years at a local factors as it had no cup on the top, got it for £100 and a new cup was a tenner. https://www.ebay.co.uk/itm/143529954252?hash=item216b0d4bcc:g:OlgAAOSw8zJe7a3M
Sgs 3 tonner just arrived. I need a jack to move it! Well pleased. Thank you for the recommendations.!