Yes, you can change hydraulic trailer brakes to electric. This is a relatively simple process that can be done in a few hours. Here are the steps you will need to take:
1. Remove the old hydraulic brake system. This includes removing the master cylinder, break lines and wheel cylinders.
2. Install the new electric brake system. This includes installing the new master cylinder, break lines and wheel cylinders.
3. Bleed the new system according to manufacturer's instructions.
4. Test drive your vehicle to ensure the new system is working properly.