Mod Request: Converting Sims 3 Gondola to Sims 4 Object

Hey! So I guess what I'm looking for is already in the title. Hahaha! I'm needing some help on converting this gondola over to the Sims 4. I have the gondola already converted over as a .package file, however, I can't get it into S4S because it's a vehicle. TSR Workshop literally won't let me do it. Ugh! So, I can provide the .package file to anyone who knows how to convert vehicles to objects. I tried following the basic tutorial and I can't figure it out for the life of me.

Thanks for any & all help!