There's not much commercially available smart tech specifically aimed at the RV market. I don't know of any RV compatible "smart" locks or thermostats. There are keyless locks and programmable thermostats, but as far as I know, none of them are controllable by any home automation controller. There's not necessarily anything RV specific about security cameras and 110V smart outlets, so there are many options there.
Having said that, if you want to get your hands dirty and roll your own, there are options. Home Assistant and OpenHab are two options for smart "brains" that don't require constant internet connection and could easily be setup to run off 12V or 110V. These could be installed on a Raspberry Pi and control a combination of off the shelf smart outlets and other controls. These systems integrate with just about any technology and combinations of different vendors.
There is a module called a Sonoff SV that is designed to switch and operate off of 12V DC using wifi. These can be reprogrammed to be controlled by HA or OpenHab. They come as a bare PC board module though and you have to provide the case and wiring. There are also Sonoff smart outlets for 110V that can be reprogrammed. Those come as a complete module, but the have to be opened up and reprogrammed to be controlled by the automation software. These solutions do require a fair amount of technical involvement.