I'd be tempted to prioritize the Joust, either the Plainsman or the Condor, and a couple of trucks for hauling/logistics. On the other hand, I might prefer to grab the LRM carrier or other vehicles just for whatever ammo and equipment they may have left. Remaining armor, ammo, and spare parts may be a more important consideration than another combat unit that you may not be able to get parts to keep working. Either way, having a couple of serviceable trucks could be a life-saver down the road in a post-collapse scenario (and you're already paying the transport tonnage for them being full, so fill them up with salvaged ammo, armor, and supplies).