Another part of the solution is also to use # 1 diesel in the winter.
#2 diesel typically has a cloud point (point at which the wax in the fuel begins to solidify) of about +40 degrees F.
#1 diesel typically has a cloud point of about -40 degrees F. Unfortunately #1 has much less energy and doesn't lubricate very well, which is why it is important to use an additive. I use Opti-Lube XPD which is kind of expensive (about $50 a gallon) but gives the best test results of any additive. It should treat around 400 gallons of diesel.
Here is another problem - what kind of fuel does the fuel dealer actually have in the #1 and #2 tank. Some dealers also sell what they call a winter blend - a mixture of #1 and #2. What does that mean? If there is a problem guess who will be out there heating up the fuel filter and blowing out the fuel lines - not the fuel dealer. If you want to do blending, do it yourself.
I know how much of a pain in the ***** gelled diesel can be from my experience with diesel cars, in particular my wife not using the right fuel and me having to deal with it.