My problem was that I had a unit, the top-level 'Corps' command unit with three divisions under it, that was 70,000 tons due to having 1000 supply trucks in it to resupply three divisions for a reasonable period of time. However, my troopships carried 50,000 tons, max. None of them could carry that particular unit. When with captainwolfer's help I reduced those units to just under 50,000 tons, my troopships were able to transport it without issue.

I just tried to see if there was an issue... but I could lift my entire division with 12 5000t capable troopship with no problem. My division have a total HQ of 80k but they rarely are maxed out and units with about 60k are most common size for them.

Now... I don't normally use so many small troops ships. I do have a fair amount of them but that is mainly to be spread out and doing regular lift of smaller formation and shuttle troops formations and reserves around my colonies. This was just a test...

So I guess as long as the ship can carry every single element in the fleet you should not have a problem with carrying them.

It is possible to move elements out of templates you have already built.

1. Go to the ground forces screen. Above the list of units you have, there are 6 checkboxes. Click on the checkbox labeled "Show Elements". Additionally, click the checkbox labeled "Amount Popup"
2. Open up the tree for your Corps Command. At the bottom of its tree, below all of the units it is commanding, there will now be a "Formation Elements". Open that up, and it will have a list of all the elements in your Corps Command. You can drag and drop the elements to transfer them to other formations.
3. When you do so, a box will pop up with a number you can put in. That number is how many of that type of element you want to transfer. So if you have 1000 supply trucks, you drag "Supply Trucks" to another formation, and put 450 as the number, so that 450 supply trucks are transferred out and leave you with 550 supply trucks in the formation. The reason the box pops up is because you clicked the "Amount Popup" checkbox, otherwise it would just transfer all of the supply trucks without asking how many you wanted to transfer.

I tend have all of my HQ formation are in sizes of 5000, 2500, 1250, 500, 250 or 100 tons. Although at 100t I don't have an actual HQ in the unit, that usually are just a squads worth of troops assigned to a small ship as a security force. Any commanding HQ larger than 5000t also can never exceed the 5000t limit and when moving an entire formation the commanding HQ is what dictate the troops ship capacity.

Make sure that no individual formation exceed 5000 tons for logistical reasons.

This makes it easy for me to transport ground units. My smallest dedicated troop transports usually are 5000 tons, this also happens to be roughly the size of planetary garrison forces.

I might not always fill up units to max size as that leave room for expansion of specialized troops or just reinforced formations.. but I generally just assume my forces are the size of the HQ for simplicity sake when doing transportation. It can leave room for some reserve formations or extra engineers companies to follow the forces to their destinations.

Most of my STO batteries are grouped in 5000t sized units as well, this makes them easy to move around as I need them.

I added a few STO units, you know, the BIG guns, to my topmost command unity for my garrison army corps. They are deep behind the lines of the garrison, and the enemy will have to get through them all to reach them. Nice. Problem is I built two such army corps, one for my brand new terraformed Mars colony, and my troop transports refuse to pick up the unit that contains those STOs. !!!?

How the Bleep are we supposed to move them? My freighter fleet won't do it. My troop ships won't. Are STOs only allowed on the world that built them there natively? How in god's creation are we ever to defend our colonies without them, cause there is no way in hell they'd be able to build them natively in the first hundred years of the game.

Can your troop transports move other units?

Possible reasons:
- If the individual unit you are trying to pick up is too big for any single transport, then it can't be transported
-Troop transports need cargo shuttle bays to pick up and unload units, unless the planet has a cargo shuttle station or starport
- Your troop transports don't have troop bays. Cargo ships can't move ground units.

I added a few STO units, you know, the BIG guns, to my topmost command unity for my garrison army corps. They are deep behind the lines of the garrison, and the enemy will have to get through them all to reach them. Nice. Problem is I built two such army corps, one for my brand new terraformed Mars colony, and my troop transports refuse to pick up the unit that contains those STOs. !!!?

How the Bleep are we supposed to move them? My freighter fleet won't do it. My troop ships won't. Are STOs only allowed on the world that built them there natively? How in god's creation are we ever to defend our colonies without them, cause there is no way in hell they'd be able to build them natively in the first hundred years of the game.