How often do you drain hot water heater tank?

We drain it after every trip now but didn't in the past. Our Hot water heater has an Anode and this breaks down a lot faster if you leave it soaking in the water over the whole season and that debris can get into your water lines (it did for us). Our TT was only 4 years old and we had clogged water pipes at the back end of our TT (the bathroom) due to debris from the Anode and hard water scale buildup and calcium deposits from visiting various campgrounds. The waterline to the toilet was completely blocked and the sinks in bathroom just trickled. It cost us $700 to get them cleaned out professionally, after our own attempts failed. The service company told us to help prevent this in the future, we should remove the anode, empty the hot water heater after each trip and remember to always use water filters inside and a prefilter outside. We had also skipped replacing the inside filter because it was a challenge to get to inside the back wall. I think for us it was the combination of things that caused this but it sure was an expensive lesson learned.