A good idea I’ve not tried myself yet is to buy 2 cheap engine stands with a single or double long box section leg. Buy a length or two of box section of the next size down and connect the 2 together with the right distance apart to mount the tub. This gives you a very professional rotisserie that can be used for lots of different vehicles.
something like this would work
https://www.manomano.co.uk/p/car-engine-stand-support-mount-heavy-duty-swivel-transmission-workshop-gearbox-182308
To end up with something like this
https://www.ebay.co.uk/itm/Heavy-duty-rollov