I am thinking about buying an 07 Tundra SR5 DC with 4x4 @ TRD offroad package. I am an archaeologist and work in northern and central Mexico in the summer and have to drive through some rough places. I am confident the 07 Tundra would handle rough and rocky fire roads and mountains fairly easily, but I am a little concerned with river crossing. I occasionally have to cross a river with water no higher than the tires and was wondering if there is anything I could potentially damage or fry in the truck. I am very careful when crossing rivers and only do so when I know about the bed, depth, current, etc. I don't want to do any heavy mods such as a lift, but I am open to small mods to help me cross the river better. Please let me know how you think the Tundra would handle a river and if there is anything I could easily damage.