I assume you are wanting to use a single-axle dolly to support the front-end.
You have a couple of options:
1. Disconnect drive shaft from rear-end and tranny... complete disconnect.
2. Tow car backwards... Front wheels on ground.
3. Get bigger dolly, to pick up whole car... This is my choice because it is ultimately safer over a long distance.
Good Luck getting her there.
Have a safe trip
76 240D (W115) - 555K miles
78 300D (W123) - 200K+ miles -- SOLD