Here are my Edgestar 86qt mods:
Fridge slideout - Built from 6061-T6 aluminum scrap pieces. The roller bearing slide is a 36" extension 250lb from TCHweb - these were under $40 shipped. Total weight of the slideout is under 20 lbs. Bolts to the 3rd row seat mounts using J-bolts. There is a 0.5" riser at the tailgate end of the slideout so that the fridge sits level with the ground when fully extended. This is the lowest profile slide I could come up with since I wanted the fridge to sit as low as possible in the vehicle.
Handle/Tiedown Mount Plate - Also built from 6061-T6. This was more work than I would have liked to do but came out nice and functional in the end. The heavy-duty chest handles I bought from TCHweb did not suit themselves to drilling the 6 original mount holes so I made this interface plate. The 1/2"x13 tapped holes at the edges use cargo tiedown bolt plates from US Cargo control. The 1" cam-buckle tiedowns are cut down ones from Harbor Freight.
Electrical - I started out with the supplied wiring, but quickly figured out it is grossly inadequate when the low voltage shutoff came on after barely 12 hours of use despite the battery voltage being above 12V. To pinpoint the problem, I wired in a GT power RC battery meter which allowed me to log min voltage, peak amps, and gross amp-hours. The fridge was pulling nearly 7 amps with the compressor on and this pointed mainly to the voltage drop through the factory wiring. So I wired in a separate circuit using a single fused 10 gauge TXL wire directly from the battery. I used a factory ground near the cig plug at the back thus avoiding running two wires to the front.
On the fridge end, I bought some "SJOOW portable power cord" from Lowe's. This is a 10 gauge cable that contains 3 conductors so it is girthy but it is very high quality and cheap. I removed the wimpy DC panel-mount connector and wired directly to the 12V power supply inside the fridge, with the GT-Power RC battery meter in the center. The connection is made through an Anderson SB 45 Amp connector which is probably overkill but it is again, a high quality and durable connector.
All of this works great. I was able to run the fridge for 36 hours straight and that's as far as I felt confident it wouldn't reduce battery life. The peak amp draw is now only 5 Amps, and the average draw is only about 1 Amp.