Software, just like so many others on HN. The trailer is an RV we take out every couple weeks during the nice weather season. It takes over 1300 pounds of payload capacity just for the trailer itself, which doesn't leave much for anything else (hitch, cargo, humans, canine). That's how I ended up trading the F150 we had for an F250. And yes, the F250 is pretty big. It's actually not a lot bigger dimensionally than an F150 (same cab, even), but it's usually taller, and it has a very stiff suspension and a live axle in the front, so it feels a lot bigger. Thus why mine rarely goes anywhere it doesn't need to go. My Model 3 is far more comfortable as a daily.