It's about that time of year. Need to start prepping my California LX for its first PA winter

I found a company that does undercoating using fluid film and based on a a description of services, it sounds like a thorough job:
- All structural and suspension components fully coated. All inner and undercarriage panels treated. Body and frame plugs removed for inner frame and panel access. Extensive service focusing on hard to access areas.
- Complete extensive inner frame-panel service. All under carriage panels completely removed. Premium door/under hood package. Wheel, tail light, and complete wheel liner removal. HD heated product on high wash areas
Not a cheap service but it will be a good starting point and save me hours of rolling around under the vehicle. Without a lift I don't see how I could do as thorough of a job myself, without spending a lot of time. I can always touch up on the back end as needed
I still want to do some level of prep work before bringing it in (need to inquire exactly what they do for prep). My LX is rust free as a starting point, so no descaling needed. But I assume it is still best practice to clean the undercarriage/inside of the frame first
I'll pull the spare tire and probably drop the running boards before bring it in. Is there anything else I should prep ahead of time? Any 100 series specific quirks that a shop that sprays primarily American made trucks should be aware of?