Two things . . .
What size force are you taking on a planetary assault- single or in a wave? also time frame?
Part of the reason I ask is that when you dust off the plans to invade a world, IMO you are going to go after strategic stockpiles using your air (or maybe aero) mobile assets to ease the burden- its what I think was part of the reason for the Clan's success.
For instance, I am invading planet X with two AFFC Regimental Combat Teams and a merc mech regiment against a Capellen garrison of a understrength mech regiment, a militia armor regiment and split of militia/regular infantry regiments along with any noble forces. Which means 4-6 attacking armor regiments and 6-9 infantry regiments that will have their own transport besides all the technical support vehicles- most of which will not be fusion powered, no matter the era. Then you have to feed and hydrate the infantry, support, armor and mechwarriors (in descending order of rough numbers per group)- yes you can pack a lot of MREs & Water on Mules, Mammoths & Jumbos but how much is enough?
Additionally, those DS are going to come in waves IMO . . . so all 3 mech regiments in combat transports, a regiment or so of armor in combat transports, another armor regiment in freighters (Jumbo!), and two or three regiments of infantry in dropships. Most of us have read enough BT novels to figure out what happens to the mech regiments in the first wave . . . but the ready armor & infantry? Setting down to go capture refineries (fuel), tank farms (fuel), water purification plants- think large RO Desal, and food stockpiles located at processing or transport centers which changes those strategic assets from supporting the defender to supporting the attacker. Likely they have their own garrison defenders or corporate/noble guards which the armor & infantry will have to overcome. Capturing those types of assets in the first wave becomes more important if its a wave of invasions like the 4SW than single planet capturing offensives. Why? Simply because in waves like 4SW, what the dropships and jumpships are hauling to each invaded world is going to be limited. What nearby worlds can contribute to the offensives will be limited.
Second, I cannot say I feel your pain . . . our baby let us sleep in. He is now two and the boss always gets upset looking when I mention sleeping in till 1100 or 1200 on the weekends. I am told the next kid will be pure revenge.