The remote lock (with doors) is standard on your Lariat. I think you may be confusing with the optional "hinge" lock that prevents the tailgate from being removed once open.
HRG
Honestly, I wish I still had the ability to get under my truck and do this kind of maintenance. If I had access to a lift, sure. Breaks my heart to see chests of tools accumulated over the years not get used.
HRG
Not sure how long you hang on to vehicles, but in MA I would think that AWD would be handy, or worth more down the road.
Also, you can now get the power sliding rear window if that interests you.
HRG
I hate to suggest this, but have you looked at the Alibaba version?
https://www.alibaba.com/product-detail/Best-Truck-Bed-Topper-4X4-Steel_1601405677831.html
Someone on here has it, and seemed fairly positive about it.
HRG
What quantities are you buying? My local guy will let me source the fluids, looks like the PTU is good with 1 qt, the RDU may need a little more than a quart (so a 2nd one), and a drain & re-fill on the trans looks like just over 5qts.
HRG
2024 Lariat Tremor (2.0EB/8-speed), 40K miles. Just got a quote from my dealer to replace the fluids in all 3.
Trans flush & fill $382
RDU $246
PTU $187
plus tax.
HRG