I have a 2 yr old and I have to make sure to keep my doors shut , or he climbs right in and turns every knob , light , switch , vent and anything else he can do , he has been doing this for 6 months now and I have 3.5 in lift with 35's . If you just let them play around it , when sitting in driveway/garage , they will figure how to make it work , then when you need them to climb up , it will be second nature . Obviously make sure it is in park/parking brake is up , when allowing them to use the Jeep playground .
He does the same thing when I have my Starcraft 11rt camper popped out , he thinks its personal playground also , I just make sure all gas lines are shut down and he cant start anything . The hard part of allowing them play in the fun places is figuring out what is going to go haywire when you turn the ignition or flip the electric on . Wipers wiping , ac blowing , when want heat , turn signals are on . In camper , all the lights/stereo are on and I get lazy and just kill with flipping a breaker .