Hi Gordon
A couple of weeks ago on Shell Island, a member's van wouldn't start, so my Suaoki kit came out for the first time since I bought it. It worked a treat, despite the charge being down to 46% when we started. It's certainly not cheap but the whole kit with compressor and a gazillion charging connectors, is very compact and light. This is pretty much what I bought, except mine's orange and a thing of sheer beauty
https://www.ebay.co.uk/itm/Suaoki-1...=item2ab6e44a72:g:bbQAAOSwSQFaE6Pb:rk:18:pf:0
The photo on the link makes the kit case look like a big briefcase but it's really not. Mine's a tad smaller than my 14" laptop. The charger unit itself is shown in the pic below, so you can get a better idea of size. You can get the charger without the compressor and all the attachments but I thought the whole kit was worth having and it certainly impressed everyone who saw it in action at the meet.
View attachment 39229