My top tips are as follows:
1. Be self contained on set with power and transport.
2. Do a complete workflow test with sound and picture before shooting. (this will involve all relevant people).
3. Have a close dialog with the DoP before and during shooting. Be aware of what color profile your monitors are set to.
I also use a Van. 10 ohrs of battery power, Eizo Color EdgeCG245W, Panasonic BTLH2550, A raid5 enclosure, raid1 enclosure, Cache-A LTO, Projectiondesign Action25 projection for focus analysis. - And of course a buddha statue to keep a positive energy so that your MacPro don't crash =) - make a clone of your system disk in case it breaks.
I deliver dailies on a rugged lacie hard drive - h264 - works great.
After chewing trough 100Tb (10 feature films and 3 TV series) of red material it all comes down to one thing that I find most important: Back Up. This is your main concern and what you need to do every day. You generate dailies, offline, set LUTs, one light, maintaining/setup of camera and all the other stuff, but if you not have a safe backup setup you of course are screwed. This might sound easy, but sometimes you are on very demanding locations - so be prepared and study the production schedule so that you don't get any nasty surprises.
Also: I must say that to be a DIT is the best job in the world!! =) You get to be a professional geek, you get to see all the material and really learn allot about filmmaking form technical aspects to artistic decisions.
Good luck mate!