ORIGINAL: Chris H
Troops load space is 5x(?) the stated space when cargo space is used for troops. Other factors involved too. I suspect your math is not complete. You need to review the manual on this.
When I do the calcs, I'm with a couple % of the stated load cost ... more than close enough. And overstating the requirement slightly as the new beta does ensures that the unit will load. Previously if you were a bit close, it might cause a fragment to be left behind. Quite annoying that.
I thought it was 3x but I cannot find the info in the manual, mind you so much has changed since the manual was written it's often a futile exercise anyway. Even with 5x it comes nowhere close to the cargo figure being requested in the TF load screen.
This is not really the problem. Using the example of the 14th Garrison unit which according to TF load screen requires 3588 cargo space. How do I know this? It's fine if you have transports in the base you can find out by creating a single ship TF and testing the load but if you can't do that and need to send some to pick it up you how many do you send?. Very unsatifactory situation to be in. If this cannot be simply calculated in the head then another solution would be for the LCU unit information screen to have an amphious cargo load as well as a standard cargo load.
If I understand your question right, the information is on each LCU's display. Near the lower left-hand corner is the tally for the LCU's current values of Troop Load Cost, Cargo Load Cost, and Stacking Cost. IIRC there is also a sum of Troop and Cargo called something like Total Load Cost, but that one is not so useful. The Cargo Load Cost and Troop Load Cost is the same as gets displayed on the TF loading screen.
So if you are planning ahead for how much space will be needed to load an LCU, look at that area of the LCU display. Do also remember that is a tally and devices within an LCU do not always fit in a ship evenly. By that I mean suppose you want to load 20 devices of cargo size 57 each, and the ships you have available have cargo space 200. The tally would say (20 * 57 =) 1,140, which is 6 ships (1,200 with 60 space left over. But, only 3 of each device will fit on a ship of 200 (3 * 57 = 171) with 29 space left over (either for supplies or let empty). Because only 3 devices fit on each ship you wind up needing 20 / 3 = 6.666, rounded up to 7 ships (partial ships don't float!).
Notice that was a very over-simplified example. Most LCUs have a mixture of different devices with different sizes, some of those being cargo type and some being troop type. And when you "cross-load" cargo into troop space or troops into cargo space, the math is different. In fact it might be different for different types of ships when you cross-load (see the manual). And for amphibious TFs it is all adjusted by 20% inefficiency.