Can you leave it at your girlfriend's place and tell your wife you sold it?
Haha
I never drank the koolaid. Giving your wife (and/or girlfriend) a ride on it is the only thing you can do with a long bike that you can't do with with a trailer. If's she's not into it, what's the point?
I totally agree about the advantages of trailer vs. long bike. Concerning handling, I can easily do no-handed track stands with three hundred pounds on my trailer. I can carry much bigger loads than a Dummy bike. Bike and trailer fit in the space under the stairs. Etc.
Don't quit getting groceries with your trailer. Driving is totally bogus dude and you know it. Haha.