The Jumper Cables with Gray Quick Connect # 3375601025 with the 4-Gauge wiring would be sufficient for most vehicles but since you're needing this setup for an F-450 as well as semis you definitely need at LEAST 2-Gauge wiring and for that I recommend the Bulldog Winch Booster Cable Set w/ Power Leads # BDW20197.
If you're the type of person that wants to be overly cautious then we even have this same type of setup but with 1-Gauge wiring as part # BDW20334, but from what I was able to... view full answer...
What you are seeing is correct, and you are right about the reasoning behind it. Since the key must stay in the ACCESSORY mode to keep the steering wheel from locking up, this means that there are some components that can drain your battery over the course of time while you are flat towing. If you were to forget to disconnect it then you would simply have a dead battery once you arrive at your destination (if it's far enough away).
While I don't have a solution for retaining your radio... view full answer...