Ground TC is not needed right now. And I'm not sure how we'd get more, design bigger trains? Better trucks?
Ok, to start, here's a list of our resources:
Forenia: 4 Ore (3 mainland + 1 from Myark) 3 oil (2 mainland + 1 from Desert) 1 Al 1 Mn
Forenia unused: 1 ore (jungle) 1 oil (mutriqa)
Cannala: 2 Wood? 3 Ore 3 Oil 2 Al 1Mg (Ti not listed?)
Here's our designs that are currently Expensive or above, and their Ore/Oil Cost:
AS-MV21-AL: 4 (2 Al), 2 (not listed as Expensive, but it should be)
T2 Breaker: 5, 2
AS-T33: 6, 3
Salamander: 5, 3
AS-1931-HAFB: 5 (1 Al), 4
UFAF-MTA-38 'Reckless Effect': 4 (1 Al), 4
UFAF-F39-W 'Haast': 5 Ore (1 Al 1Mn), 4
Very Expensive:
Death Ball: 6, 2 [Complex]
UFAF-F-40 "Thunderbird": 4 (1 Ti), 4 [Complex]
UFS-CV-40 'Zheleznogorod' B: 6, 5
And the good old AS-ARAC, which is a National Wonder at a stunning 10 ore.
If we retain the Jungle, and reduce the Cannalans to Basic Naval Advantage, the following drop in cost:
AS-MV21-AL, T2 Breaker, Salamander, HAFB, Reckless Effect, Haast to Cheap. Thunderbird and the Z Carrier to Expensive (dear god).
If we retain the Jungle, but the Cannalans interdict shipping, the following drop in cost (assuming we choose the ore, of course):
AS-MV21-Al, T2 Breaker, Salamander, HAFB, to Cheap.
If we lose the Jungle, and reduce the Cannalans to Basic Naval Advantage, the following drop in cost:
absolutely nothing!
The Sealift is a very powerful option assuming the first happens, in particular, dropping the cost of the Thunderbird and Z Carrier to Expensive will practically guarantee we reduce the Cannalans to Basic Advantage for subsequent turns as well, eliminating all TC interdiction concerns. If the second happens, it's also quite powerful, albeit it won't boost our naval strength that much.
However, if the third situation happens, we gain nothing as the Mutriqa oil will not by itself make anything cheaper. We can thus see that retaining the Jungle is important to get that ore.
Here's where I argue that we will not retain the Jungle. I am reasonably assuming here that the Cannalans will go for their own fighter jet to match the Thunderbird. Their jet will only have a 1/6 chance of being as good as the Thunderbird quality-wise, but it will probably be the same cost, at 4 ore 1 Ti 4 oil. Another assumption is that they will spend their revision to make their own engines non-[Complex], or else already have it as such due to turboshaft engine experience. If they do that, it becomes Expensive, and if they spend their DEVIL WEED credit on it, it becomes Cheap. An inferior Cannalan jet that is Cheap will beat out the Thunderbird that is Very Expensive and cause us to lose air superiority. I am confident to say that if we lose air superiority, we will almost certainly lose the jungle, since so much of our forces depend on it (Firecracker bombing, Haast CAS, paratrooper insertion, etc.). Possibly the only bright spot is that their new jet won't have an effect at sea until they design a new carrier or revise the Santos, for all the good it does us.
So that's a lot of assumptions to make about what Cannala will do. But I think it's the most rational course of action for them, unless they roll out radar-guided SAMs or something.
Hence, the Sealift is too high-risk high-reward for my taste. I admit that it's sorely needed to deal with our TC woes, but now is not the time. Voting for the aT-J04 builds on our lead in the field of jet aircraft, and builds on the fact that we've just designed a carrier to launch said jets.
FAKEedit: I'm pretty sure the number of wheels a truck has is only slightly correlated with its transport capacity.
EDIT: The Stinger is currently already Cheap, not Expensive. However, it's mistakenly listed as such in our equipment list.