Or you could if you want to jump start either the Grenadier or another car, just get a regular set of heavy duty jump leads and use the jump start post under the bonnet.
This day and age, it seems like jumper cables are a large bit of unnecessary kit, particularly on planned journeys. The little Lithium Jump Packs seem to do the job just as well (assuming you monitor charge status) while taking up much less space and weighing much less than a good set of Heavy Gauge Jumper cables.
Added bonus, no 'Cable Length' issues to contend with. Cause no matter how long the cables, they always seem a tad too short (kind of like winch cables)..
And they are comparatively (to this NATO plug solution) cheap!