I think you have to wait 5 minutes before you can rez your bug at the trainers?? Not sure though.. JK JK JK..

I'm guessing that you mean keeping him safe from the random mobs you recall on top of, and not the pk's that don't seem to exist anymore?
I just saw someone scripting right next to my house that had quite the setup to keep himself and his bug alive. Similar to what jtw said above. He had his bug along with a nightmare and an elemental slayer bow.
Now I would never use that much taming skill on a miner for one, not when a vollem is identical to a nightmare (exact same, other than you can't ride it). When he recalled to the mountain, script told his mare to guard him, and it was picking off the random corpsers and reapers that periodically show up outside my place. As well as the ore elementals that he was pulling off the mountain from using his garg pickaxe. Coupled with the comp bow he was carrying...I think you get the picture.

All in all. His bug never even got looked at cross eyed..