I have a 2WD 1 ton with a dump body that has always pushed just fine. But with me, it is a self security issue. Kind of like that little blanket I had as a kid. I never had any problems because I did not want to get into any situations that looked too risky. The truck could really push some deep stuff and stack it high, but I only plowed on nice level lots.
I do not have employees and all of my family and really close friends are not local, so if out doing snow removal at 3:00 in the morning and I get hung up really bad, I have no one that could help me right away. Everytime I plowed with the truck I felt uneasy. With having other trucks that are 4x4's, I know the value of that front drive axle when you need it.
That is why I got a mount and switched the plow to one of my other trucks that is a 4x4. If I ever have two trucks running, I would not mind one of them being the 2WD dump, but with having only one truck plowing, I feel much better that it is a 4x4.