While re-reading I noticed that you were planning on using the T2 and EZ-Steer from the sprayer to run with the EZ-Guide 500. The firmware for these with the EZ-Guide+ is different than the firmware for the EZ-Guide 500. So when you switch from the sprayer to the tractor and vice versa you will also have to switch firmware versions. Not the end of the world, but it does require you to have a laptop with a serial port and the appropriate software or you'll have to take the whole setup inside and provide a 12 volt power source if you're going to use a desktop. Otherwise you'll have to take it to a dealer to get the firmware switched every time. I'm not sure what software you need to switch the firmware on these units. I'm pretty sure it's a free download off the Trimble site though. Anyways, it's another issue. The MojoRTK unit requires that you have the firmware that is compatible with the EZ-Guide+ installed on your EZ-Steer/T2 combo.