For its aperture and capabilities I'd say an 8" Dob is the lightest configuration you'd get. An 8" refractor would be a monster, not to mention unaffordable and any Mak, Cas or whatever would still be a heavy option.
The trolley idea suggested seems the best and cheapest option. Can you store it in a garage and just roll it out ? No lifting inolved, make a snug cover to keep it clean and dry.
I rebuilt my 10" into a much lighter truss configuration but that would be a major rebuild although I more than halved it's original weight. It was a heavy DIY build to start with.
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