The short answer is no. In fact, before we got our Ring Security System, we purchased a SimpliSafe before we ever got our RV. You can see it in our original RV tour video. The trouble is with monitoring. To have a monitored system, you need a permanent address (for police dispatch and such), which doesn't work when you move all the time. And, the SimpliSafe system is crippled without monitoring. This is from Simplisafe:
"While most of our customers opt for 24/7 Monitoring with either our Standard Monitoring ($14.99/mo) or our Interactive Monitoring ($24.99/mo) plan, you do have the option of monitoring the system yourself for no additional cost. Unfortunately, while self-monitoring your system there are many limitations. Without 24/7 Monitoring you would only be able to Live Stream and receive Push Notifications from the SimpliSafe cameras but not the SimpliSafe system." https://simplisafe.com/forum/customer-support-forum/getting-simplisafe/smartphone-app-without-subscription
The Ring Security System, however, can be completely self-monitored. We've been using it for a couple of years now, and it's been great! It does require you have internet access.