Yes, sharing wages is always a good thing at work! My company has a tradition of an anonymous salary survey, so folks can properly grasp that it's the company's fault you aren't getting enough.

Your work sounds very unique, but thankfully I've been there a few times trying to figure out an appropriate bargaining unit. There aren't any hard and fast rules or laws on this topic, but it gives us flexibility to decide how big we go. Traveling and working at a national company has some good precedence with the Teamsters and NALC, as long as you have a "home" office that you work at when you aren't traveling, that should be enough to claim an appropriate unit.

It's ok to be first, someone has to be! What you're referring to, where unions bargain for an industry minimum for all the workers in a particular industry, is known as sectoral bargaining. It exists, but it will take time. You're taking the first step towards that point, but start just with your workplace. I also understand your concerns about the work being unique and small. Protected concerted activity only takes 2, so there's always enough people! When it comes to bargaining, you and your coworkers know the work best, which is why you elect a bargaining committee from your coworkers. For the time being before you get too concerned about how bargaining will go, you must win your union first. Even industries with sectoral bargaining still need to organize workplaces to bargain the stuff that isn't covered by the standardized working conditions.

I'm open for DMs to continue this if I didn't cover everything