Xantium (G1)

The Autobot battlecruiser Xantium transports the Wreckers from mission to mission. It looks like it transforms into some giant robot.

IDW Generation 1 continuity
The Wreckers used the Xantium to travel to and from the final showdown with Squadron X on Pova. The ship later took them from Varas Centralus in the Kol System to Cybertron after being redeployed there on Optimus Prime's order. En route, Springer advised Prime that, if they couldn't stop Thunderwing, they should destroy him along with what was left of Cybertron.

Wreckers fanboy Ironfist will rant to you at length why the Xantium totally has a robot mode. His workshop was designed so that with a few layout adjustments it would resemble the bridge of the Xantium.