To take full advantage of your KAT500 and KPA500 you would need a base station computer. This would allow you to use software to control them. I use a K3, a KAT 500, and a homebrew 1KW solid state amp. Which I access from my RV. I dedicate a PC for the remote base. Take a look at Win4K3Suite. It provides an integrated control of the K3, the KPA 500, and the KAT500.
I use Team Viewer for remote access to the PC, and Skype for audio.
My remote station is my primary station, and I use it from home and when in the RV. I can access it from a laptop, or from a SmartPhone. You may find when traveling that your Internet speed won't be the best. I find the wireless in RV parks to be unusable. I instead use my phone as a wireless hot spot and get much better bandwidth and less latency.
73,
Don
K9AQ