Any electric vehicles out there that can be

CoeyCoey wrote:
What I want is an EV that can be towed, and then the regenerative braking power goes into the car battery and house batteries. Also, you could use the EV as an extra battery back for electricity when boon docking.

The only flaw in your plan is that pesky law of physics known as the law of conservation of energy. Simply put, energy cannot be created. The energy you would put into the batteries would come from increased loads on the tow vehicle. Any savings in costs of recharging from a traditional plug connection would be more than offset by decreased fuel economy in the motorhome.