I can see agreeing to take a neighbor who you trust AND who has his go-bag already packed. But this isn't something you decide to do while you're lugging stuff from your home to the car. This neighbor/friend needs to be preselected and what he/she packs is agreed to and dovetails with your stuff.

The problem I see is any late/last minute packing and triage of gear that causes expensive time delays. All that needs to be decided way ahead of time.

Dagny,
How much stuff can you preposition with the trailer you have in storage to save room in your vehicle?