If you intend to run the truck mainly off road , a 1HZ , is fine .
But 1HZ motor is made for the third world markets , any fuel ,any oil any road , no matter how bad it is , the truck will Handel it .
If you are thinking to use the truck all rotund on comune roads , freeway , highways , go with a HDT , or even better HD-FTE ,
The swap is not difficult , and your sadisfaction on road will be much higher .
I can cruise all day at 75 miles /h with a HDT , with the car fully loaded , no overheating , no issues..
Top speed will be approx 150 km/h approx .but I do it just for short periods .
The sweet speed for my truck is 70-75 miles/h.
In off road you don'loose anything .