I have done all of Southern Africa (SA, Nam, Botswana, Zimbabwe, Mosambik etc.) in a 4wd camper about 20 ft long, a little over 7ft wide and almost 9 ft high. I had no problems but I wouldn't want to have anything bigger. Height was the most critical factor because of low branches. You should check the weight restrictions of the National Parks though. Quite a few don't admit vehicles with more than 3.5 t GVWR (about 7700lbs) or restrict them to the main tracks or charge outrageous fees (200US or more per day for the truck alone). A 3/4 or 1 ton truck would exceed that. My car papers were checked twice in Botswana to make sure that my camper did not have a maximum weight rating of more than 3.5 metric tons. They did not weigh it though otherwise I would have been in trouble.Has anyone ever overlanded with a full size rig in Namibia or Botswana? I'm interested in seeing how good a full size rig performs in Southern Africa.
Based on your experience driving the F-150 did you find it capable enough for Botswana, or did you find the popular Hilux to be more capable in that terrain?re "was just curious as to why no one ever overlands in something like a Ford F-150 or Ram 3500 in Africa"
A key concern overlanding anywhere is whether you will be able to find spares, whether for routine maintenance or for unscheduled repairs. Ford doesn't sell the F150 in Africa as far as I know, and Dodge is no longer selling anything. This is a generalisation, I realise, however I am fairly certain that you won't find either for sale in Namibia or Botswana. I don't think many, if any, were ever sold (I did drive an F150 many years ago in Botswana - brought in for a specific project, and I suspect that it was the only one in the country. We did our own maintenance - there were no dealers at all). So, you won't find parts, mechanics won't be familiar with maintenance or repair, and if you ship one of these in, you'll need spares and skill to do it yourself. If you break something you haven't brought with you, it may be weeks (or never) to get a replacement.
I've seen a few big North American vehicles in Africa, usually either waiting for spares, or abandoned when fixing them was impossible, or simply too much trouble. About the only North American vehicle I have seen in Africa is the Jeep, and they are few and far between outside cities. It just makes more sense to travel in something for which spares are (more) readily available, and with which mechanics are familiar.