I've not found a trolley jack that won't lift a Morgan, they aren't that low. The aluminium alloy 'racing' jacks are quite nice, they are light and easy to use, and they have a rubber pad on them to prevent damage to paintwork. I got one from Machine Mart, but they are available all over the place, things like this: trolley jack

If you don't fancy paying 120 of Her Majesty's Imperial Credits, then you can get a much cheaper one from Halfords

Whatever you go for, do not under any circumstances work on your car when it is supported solely by a trolley jack. The only purpose of a trolley jack is to lift the car high enough to get axle stands underneath, and to lower the car safely onto those stands.

Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE