RRU (and FRU, different name for the same thing) pays exactly the same as normal EMT/Paramedic roles. I had to apply for it, and I think I got it because the exact number of places had the exact number of applicants... I only had to prove that I wasn't an idiot before going on the RRU, and show that I could drive it without hitting any walls. I have no idea about the Motorcycle response units, as there is no way you are getting me on one of those deathtraps. You can be pretty much anything on an RRU/FRU as long as you can get to calls within 8 minutes... Hope this answers your questions.