Thank you for the pictures from Douala! (anything to do with food gets me excited)
I'm exploring and working in the Yukon right now, just ran into the Dodge Caravan van I met earlier last month. It has over 400,000 miles, strictly driving back and forth on the dempster. They only carry ones spare. Repair kit is a great plan, be sure to include a pump also.
This season like others, have met many Travelers over the last couple months, many do not carry spares, or self repair ability. They admit to relying on the kindness of passerby's or other travelers. Remember that the routes you m will be traveling, are regularly traveled by others. In the North I'd like to think others, seeing someone in need, are more likely to stop and help than any other area you may travel.
As someone exploring lesser traveled areas of Yukon and Alaska, thinking my age is such that these are my last years of following quad trails on motorcycle. A comfy car sounds amazing. Pictured is 40 km's into the Yukon alpine with 15 km's to go (and I'm tired at this point)