A couple things to consider. The first and possibly the most important is whether that 5er has a 50 amp service. If not, the 30 amp will probably not run two a/cs (30 amp service = 3600 watts vs 12,000 for 50 amp service)
Next - do you want to limit the a/c output by going with a 11K Btu unit? A 13.5 really does a good job in the front of ours where an 11 may not.
120VAC wiring to the vent - wouldn't bet on that in an '06. If there is a plastic outlet cover on the ceiling near that vent, you may be in luck. If not, pulling wires is a nearly impossible job and you need at least a 12AWG feed to the breaker. I would consider a surface track across the ceiling then down the wall to the front compartment then to the breaker box (
https://www.homedepot.com/b/Electric...s/N-5yc1vZc65f )