STEPS TO REPRODUCE:
1. Build a space platform and vanilla rocket silo. Enable automatic requests from space platforms.
2. Have the space platform request an item heavier than 1 ton. This is only possible with mods. There are two ways I have found:
Mod in a building over 1 ton, and try building it ...

Upon further testing, after modding in a rocket silo big enough to launch up a nuke, I can now transfer nukes between my space platforms, regardless of whether or not I actually build said bigger rocket silo...
Why does the hypothetical existence of a bigger rocket silo affect the cargo pods? only ...

If they can't be sent up to space via shuttle, what makes you think they can fit into cargo pods?

I'd say this is working as intended.

They CAN fit in the cargo pod, because you can drop them down from space to the ground. ALSO, buildings >1 ton CAN be delivered between space platforms as part ...

SETUP:
With the addition of inter-platform logistics, I wanted to try manufacturing nukes and rocket silos in space to send them interplanetary.
I set up an orbital factory floor over nauvis that produces nukes and rocket silos, and I created another transport vessel.

THE PROBLEM:
I cannot request ...