Col while browsing an old book on scopes I came a cross a photo of a refractor about that size, under which the owner had used a Volvo wagon as the mount. There was a frame on top of the Volvo like a large roof rack to support the scope (and presumably transport it), and jacks placed under under side of the rear end to stabilise it.
From what little was visible it meant the scope didn't have to be lifted off to be mounted, as the transport was also the mount (!)
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