A bike with a sidecar is heavy. here's how we do it with a Ural.
We carry a 2x4, about 12 to 18 inches long, beveled at one end. We lay this under the rear tire. As we lift and pull back onto the centerstand, it goes up easier. On a ural, this will allow enough clearance to pull out the back wheel.
If you have engine guards, with a ural you can lift the sidecar up and rest the bike on the left engine guard, for access to the sidecar tire.