FORD RANGER OR HILUX OR TRITON OR NAVARA? I AM CONSIDERING THIS AS MY 2ND VEHICLE.

To exactly answer your question, the general consensus is obviously HILUX. But if you can be a little bit flexible with your criteria, perhaps you can safely go for the RANGER. In as much as I love the HILUX, to this day, I still cannot get past the fact that one needs to service the HILUX EVERY 5000km
I do understand that Toyota justifies this for reliability, durability and warranty (of course, they wouldn't admit it, but also for economic) reasons. But let's not forget that diesels are always high mileage vehicles. 5000km will be covered within 2 weeks if a diesel is driven as how it is meant to be driven.
If Ford and Mazda can put 10,000km service intervals to their diesels (heck...BMW puts it between 15,000km to 20,000km even with M'sian poor diesel), why can't Toyota?
So, brl, it's your call. If I were to be in your place and with the choices you listed above, I'll go for the RANGER. However, if this is uncharted territory for you and you prefer the safe route, you won't go wrong with the HILUX. Happy hunting