From R2.8, Fed Tug:
Can carry one or twp pods; one but not both can be a "double weight" pod. If there is a double weight pod, it must be in front.
If a Light battle pod is in the rear position, all systems on the pod are treated as cargo. Battle Pods cannot be the rear pod in a pair as it is double weight, and forced into the front slot...
From the LTT's description:
Can only carry one pod, but it can be a double-weight pod.
Pod weights:
Starliner, Cargo, Repair, Troop Transport, Self Defense, Light Carrier (CVL), Light Battle are 1-weight pods
Battle, Carrier (CVA) are 2-weight pods (and therefore only in front)
So, believing that the only pods really in need of separate textures are the battle and carrier pods (Starliner pod needs more windows but is rarely used, Troop Transport, Repair, Cargo, Self Defense are probably stock pod hulls), the paired combinations on the main tug are:
CVA / CVL
CVA / Stock
Battle / CVL
Battle / Stock
Stock / CVL
Stock / Stock
The LTT would need a Stock, Battle and CVA / CVL pod, no combinations allowed...
Just some friendly information for the tug-builders out there...