pretty much zero concerns on the '06-'07 d-max injectors. mine is a 2007 classic (lbz) and love it. my trailer setup weighs about 15k and it'll pull it without breaking a sweat.
unloaded I'm around 15-16mpg (I drive it fast) and towing what I have is typically 8.5-10mpg (tow kinda fast too)
mine has a few goodies added to it as well for performance and love driving it every day.
only the LB7 has some issues with injectors (first d-max), but they are still great motors