Particulate respirators are the simplest, least expensive, and least protective of the respirator types available. These respirators only protect against particles. They do not protect against chemicals, gases, or vapors, and are intended only for low hazard levels.
A factory tow package usually includes heavy duty rear shocks/springs and an auxiliary transmission cooler in addition to the tow hardware itself, and sometimes they include a full size spare tire too. When a dealer installs it they just put on the hitch and wiring plug.
That's a lot of designing and upgrading! While it may sound very convincing, it's important to remember that not all vehicle tow packages come with all those upgrades. Some come with a portion, some simply include a hitch and trailer wiring package. However, most original equipment (OE) tow packages include some or all of the aforementioned upgrades. Not For Everyone. Not all trailer towing activities will require all these upgrades and designed-in capabilities.