Well, I thought that my order was final ... MB came back and said that I couldn't order the H88 Rear Heater Prep option without also ordering either the HZ9 Fuel Fired Heater Booster option or the H12 Fuel Fired Pre-Heater/Booster option. Therefore I added H12 since it will have some additional utility for me -- engine block pre-heating in very cold conditions.
I will update the SMB Sprinter order document and my decision spreadsheet to reflect this addition.
2018 Sprinter 4x4 RB150S w/PH Lithium Build ("Starr Van")
Pictures of some Starr adventures (starting in 2019): https://rick.samcos.com/galleries/
You might also consider adding the remote. It's $300 or something, but has a nearly 2 mile range. Not sure what your usage will be, but I know we'll take full advantage of it when we're headed back to the van after skiing. Might seem like a lot, but when looking at the total cost of the van - it's a drop in the bucket