I would put the tub upside down on the roof with wooden crossbars to spread the load onto the ribs, or alternatively, make purpose built load bars and bolt them to the tub. A crossbar, padded underneath to rest on the ribs, and with feet at least six inches long to fit in the gutters and clamped to them should work. The tub is not all that heavy.
Obviously needs to be well secured, and take it easy.
Personally, I would probably rent a trailer - you can carry a tub on a 6x4 box trailer - I've done it.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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