I am not sure if this is intentional or not, since Vehicle Roboports are fully compatible with Spidertron, but modules such as the "Area Expander" don't "fit" inside the Spidetron.

Every other vehicle but Spidetron accepts these modules, so I think this is not intentional.
~~sorry about my english

I think this is likely because I was rushing for a 1.0 release.

See... I made the groups and categories a little weird, so when it comes to certain types of equipment, you have to assign them to each vehicle type. This includes for example "cargo-wagon, car, tank, spidertron" for roboports, or "locomotive, car, tank, spidertron" for... "Acceleration/Speed" equipment, like the exoskeleton is.

I'll add it to my list of things to look into, along with the lack of belt immunity equipment for the spidertron.

Yeah, I noticed. I opened up your "roboport.lua" and changed it myself, after creating this thread. Now I can use my Spidertron to do silly builds.

It is for private use only, so I'm not breaking your licenses, :D

Also, thanks for your attention and answering this fast.

I released an update that should fix it, along with a couple of other things.