can i still start my van to get it on a trailer if the main drive belt is gone?

Yes, but only for a short time. you can do it several times if necessary. Just let it cool down completely before each attempt. DO NOT LET THE VEHICLE RUN LONGER THAN A COUPLE OF MINUTES! There is no belt which means no water pump to pump coolant. Thus the whole letting it cool down in between starts.

When you say your wheel do you mean your steering wheel or a wheel on the car? All car's have some sort of wheel bearing. Some are sealed into a hub assembly but there needs to be some sort of bearing for the wheel to turn. As for the external drive belt and driving onto a trailer. That belt operates the power steering pump, alternator, A/C, and water pump. It can be done if done quickly. The power steering won't work and the coolant won't flow so you put the vehicle at risk of overheating.

If the wheel is locked how are you going to get it on a trailer? Can run engine without belt long enough to load the van on trl. just dont take forever!