AFAIK, you can get the cameroon visa at the border, don't quote me on that though. Chad will almost certainly require a visa beforehand. Personally, the crossing from Nigeria-Niger-Chad and enter via the Lake Chad route through Bol will be more interesting and pleasant (providing you don't get too much hassel from officials or the locals), I guess it depends where in Chad you want to go to and what your mode of transport is.
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