I basically took the Templin Institute video: Building An Entire United Nations Space Command Armored Regiment, link provided
https://www.youtube.com/watch?v=BdnUX3vxIJs&ab_channel=TheTemplinInstituteand wrote it down. I changed a little bit, but it should be very similar.
Headquarters and Headquarters Command Company
Mobile HQ vehicle
4 Heavy Transport
24 MRAP
6 Heavy Trucks
1st Combined Arms Battalion
HQ
1 tank + 4 IFV
18 Heavy Transport
16 MRAP
8 Heavy Trucks
Armored Company
2 tanks HQ + Heavy Transport + Heavy Truck + 2 MRAP
12 tanks
Armored Company
2 tanks HQ + Heavy Transport + Heavy Truck + 2 MRAP
12 tanks
Mechanized Infantry
2 IFV HQ + Heavy Transport + Heavy Truck + 2 MRAP
12 IFV + 3 Infantry Platoon
Mechanized Infantry
2 IFV HQ + Heavy Transport + Heavy Truck + 2 MRAP
12 IFV + 3 Infantry Platoon
2nd Combined Arms Battalion
HQ
1 tank + 4 IFV
18 Heavy Transport
16 MRAP
8 Heavy Trucks
Armored Company
2 tanks HQ + Heavy Transport + Heavy Truck + 2 MRAP
12 tanks
Armored Company
2 tanks HQ + Heavy Transport + Heavy Truck + 2 MRAP
12 tanks
Mechanized Infantry
2 IFV HQ + Heavy Transport + Heavy Truck + 2 MRAP
12 IFV + 3 Infantry Platoon
Mechanized Infantry
2 IFV HQ + Heavy Transport + Heavy Truck + 2 MRAP
12 IFV + 3 Infantry Platoon
3rd Combined Arms Battalion
HQ
1 tank + 4 IFV
18 Heavy Transport
16 MRAP
8 Heavy Trucks
Armored Company
2 tanks HQ + Heavy Transport + Heavy Truck + 2 MRAP
12 tanks
Armored Company
2 tanks HQ + Heavy Transport + Heavy Truck + 2 MRAP
12 tanks
Mechanized Infantry
2 IFV HQ + Heavy Transport + Heavy Truck + 2 MRAP
12 IFV + 3 Infantry Platoon
Mechanized Infantry
2 IFV HQ + Heavy Transport + Heavy Truck + 2 MRAP
12 IFV + 3 Infantry Platoon
Cavalry Squadron
HQ
1 tank + 4 IFV
18 Heavy Transport
16 MRAP
8 Heavy Trucks
Cavalry Troop
2 IFV HQ + 4 Heavy Transport + Heavy Truck + 2 MRAP
12 IFV + 3 Infantry Platoon
Cavalry Troop
2 IFV HQ + 4 Heavy Transport + Heavy Truck + 2 MRAP
12 IFV + 3 Infantry Platoon
Cavalry Troop
2 IFV HQ + 4 Heavy Transport + Heavy Truck + 2 MRAP
12 IFV + 3 Infantry Platoon
Armored Company
2 tanks HQ + Heavy Transport + Heavy Truck + 2 MRAP
12 tanks
Regimental Engineering Battalion
HQ
Command Van
8 Heavy Transports
10 MRAP
4 Heavy Trucks
Engineering Company
4 IFV
4 MRAP
4 Heavy Transports
10 Combat Engineering Vehicles
4 Construction Mechs
4 Bridge Layers
10 Heavy Trucks
4 Haulermechs
Engineering Company
4 IFV
4 MRAP
4 Heavy Transports
10 Combat Engineering Vehicles
4 Construction Mechs
4 Bridge Layers
10 Heavy Trucks
4 Haulermechs
Military Intelligence Company
4 Command Van
16 MRAP
4 Heavy Trucks
Signals Company
12 MRAP
4 Heavy Trucks
2 Command Vans
Air Defense Artillery Battalion
HQ
Command Van
4 heavy transports
10 MRAP
4 Heavy Trucks
ADA Battery
12 SPAA + 6 Heavy Transport + 6 Heavy Trucks
9 Loadermech
10 MRAP
ADA Battery
12 SPAA + 6 Heavy Transport + 6 Heavy Trucks
9 Loadermech
10 MRAP
Artillery Battalion
HQ
Command Van
12 IFV
12 heavy transports
10 MRAP
10 Heavy Trucks
Artillery Battery
12 SPG + 6 Heavy Transport + 6 Heavy Trucks
9 Loadermech
10 MRAP
Artillery Battery
12 SPG + 6 Heavy Transport + 6 Heavy Trucks
9 Loadermech
10 MRAP
Artillery Battery
12 SPG + 6 Heavy Transport + 6 Heavy Trucks
9 Loadermech
10 MRAP
Heavy Artillery Battery
12 SPG + 6 Heavy Transport + 6 Heavy Trucks
9 Loadermech
10 MRAP
Regimental Support Battalion
HQ + Headquarters Company
Medical Company
Field Maintenance Company
Distribution Company
7x Forward Support Company
Special Warfare Group
[Classified]
The regimental support battalion would vary in size based on location and available resources which would
The formation contains 169 listed heavy transports, 136 heavy trucks, 278 MRAPs, and while there's a lot of specialized equipment, I imagine that most of it can be removed should the RCT need to move, and truck, transport, and MRAP hulls can just be procured locally assuming the planet has a good industrial base or filled out over time assuming an outback or periphery posting. That or they can just take over whatever the previous unit left for them assuming they're moving from a garrison post to another garrison post.
It's also notably not a mobile formation in a strategic sense. You could transport all of it in a Mammoth as cargo (the regular dudes get stuffed into a mule traveling economy class), but you're never going to combat drop with it. It's just not configured for a teeth first approach, and more suited to high intensity campaigns across a planet's surface or acting as an anchor for local/militia formations.
When answering a batchall, you report that you have "7 tank companies, 9 mechanized infantry companies, and non-combat support elements". The ADA battalion should be brought up only later only in the event that they bring aero assets and bid against those not against their ground warfare units.