Although many of the road trip hacks on this list revolve around the road trip itself, you should also make sure that you prepare your home for your road trip before you leave. Of course, this involves locking all of the windows and doors and setting your house alarm - but this also involves turning your water off. After all, the last thing you want is for your house to flood while you're away.
By turning your water off, you can remove any chances of a burst water pipe or flooding, and it means that you won't have to pay for any water usage while you're away.