Most vehicles were recalled for the F37. There should be a sticker under the hood if it was done. You can only get 2005 and 2006 year models in North America. CRD stands for Common Rail Diesel. Refers to the type of fule injection used.
Ohter option is the Grand Cherokee Diesel. More recent years and more expensive, bigger Mercedez 6 cylinder engine. Next would be the VW Touareg TDI, or BMW X5 Diesel (also some Mercedez SUV's available) All much more expensive and likely not the vehicle you would want to take off rading.
I would say get the GDE tune instead of the Provent. It offers more power, beter fuel economy etc... my
