I'm attaching a diagram we made for the dimensions of the smaller jacks that come with the Lippert Ground Control 3.0 # LC358590.
Please note that there is some wiggle room as to where you can mount the rear jacks. If you check out the linked instructions and the attached photo for the departure angles you'll be able to compare this to the exact layout of your Keystone for best placement. view full answer...
According to Dexter, 10" Electric Brake Assemblies like the # K23-462-00 and # K23-463-00 should be secured to the axle with brake mounting hardware like the # BRKH10B. The # BRKH10B should be tightened to between 45-ft/lbs and 70-ft/lbs. view full answer...
Please see the linked installation instructions for the Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1621 or 1621HD, # LC328330 for proper torque values based on your hardware bolt size and grade. view full answer...