While I understand the use of pesticides, over use just wouldn't be healthy and I believe breathing in that******is very unhealthy. I've never had an issue with bugs or spiders but living in the PNW we don't have many to be concerned about.
If you have a bug phobia and it's a real concern, you might want to look at getting some Diatomaceous Earth and since its harmless to people and pets alike, I'd sprinkle it around any part of the TT that touches the ground, electrical cords, tires, etc so crawly things can't come up. If there is no phobia, I wouldn't worry about it until I saw something and then I'm just remove that particular critter.