The lady from the Torrence Design team (sorry I forget her name, that was 19 years ago) stated that it was specifically because of NHTSA rules regarding rollover potential. This was in the aftermath of the Ford Explorer debacle and most automakers were wary of the rollover potential of their SUVs. Obviously J**p said "FU" and kept making solid front axles J**ps and didn't get sued like Ford did, but that was kind of the background to this 2005 conversation with the FJC designers. Solid front axles on 70 series that are sold outside the NA market aren't subject to NHTSA rules, or USA lawsuits, so Toyota can sell what the market wants without government regulations or lawsuits dictating what they are permitted to or are willing to sell.
The other thing about Toyota selling IFS versus SFA has much to do with the market. In the USA, and in Europe, we have mostly paved roads that whatever vehicles are likely to drive on. South of the equator, there are fewer paved roads, and that's where you'll see more SFA Land Cruisers and Hiluxes.
As far as maintenance, south of the equator, it is doubtful that any vehicle receives much maintenance. My friend Dom from Namibia told me that pretty much all he and his company did on his fleet of 60s and 70s that he used for his safari company was change the oil and change the tyres (he had split rims and would change out the inner tube when they'd get a flat). Flat tyres were his biggest issue.
He also told me that elephants were the most deadly creature in the jungle. Forget about lions and baboons, elephants will kill your ass.