What size ships can we fit in the Galaxy's rear hangar? For example, will a MISC Prospector fit there? Does the rear hangar have a ramp/lift for ground vehicles, or can ground vehicles only be used with module lifts?

The rear hangar is an XXS hangar and, as such, is not capable of fitting a MISC Prospector. However, the refinery module is fully compatible with the Prospector and Argo MOLE's cargo saddlebags, so they can still offload their materials to be refined.The rear hangar does not have a ramp, as a ramp at the required angle would extend the ship's footprint beyond its designated hangar metrics, denying it the use of certain landing pads and facilities. Another lift at the rear would have minimal clearance for loading compared to the central module lifts. Therefore, only the central area is compatible with ground vehicles by design.To try and clear up some of the confusion that exists with hangar sizing, we have XXS, XS, S, M, L, and XL hangar metrics (sometimes referred to as S1-6 after the fallback XML value). A ship must fit entirely within one of those sizes to spawn. However, we do not have all hangar sizes at all locations. For example, the smallest hangar at most space stations and landing zones is S, so any XXS or XS ship spawns there instead. Landing pads at places like Port Olisar and planetary outposts go down to XXS. Examples of ships that fit the XXS metric are the Anvil Pisces, Argo MPUV, MISC Razor, Origin 85X, and Origin M50.