There are a couple of write ups on the forum from the people who did it on their own, when you get access you can check it out, seems they lifted the slide slightly to get them under. I read when the slide is out, a pry bar is all you need to lift it enough to get the plates in place. Here is a exerpt from one guy who used a bottle jack:
"Well, today I installed the slide runways on our 1885. Start to finish was about 2 ½ hours. That being said, if you are still under warranty you may want to have your dealer do the install as it's a lot of overhead work (a real pain in the a..!) and tough if you wear bifocals. Anyway, it all went fairly smoothly, jacked up the slide with a bottle jack and 2X6's (just enough to slide the aluminum runway over the roller), measured to make sure everything was plumb, drilled the holes and installed the rivets. Checked the roller tightness and ran the slide in and out to check everything."
Here is a pic from the post:
2016 Windjammer 3006WK
2010 Dodge Ram 2500, 4x4, Diesel, Front Hitch, Air Lift 5000 Rear Air Bags.
Equalizer E4 1.4k/14k WD Hitch.
TST 507 TPMS
Furrion FOS48TA Observation Camera
Garmin RV-760 GPS