For hill climb you shall never use Rock mode. Rock mode is programmed to avoid whell spin at any cost (to avaid tyre damage or lose control of vehicle) and will in specific situations cut power on the engine.
For hill climb the best is Sand mode with low range selected, because it permits some whell spin, higher revs and keeps the traction control on to hell you.
Many people think that Rock mode is the best mode..always. No. It is not. Rock mode is only the best option when you are really rock crawling and you need a very progressive (long/slow) accelerator, very small whell spin, an open torque converter and keep the gearbox in 1st gear. I have a Trailhawk and I like the rock mode (because is very smoth/progressive) even for hill climb, but if it is a high slope hill climb, the sand do better.
Regarding your initial question, I don't think you can have the Roch mode programmed on non TH versions.
The Trailhawk has many differences to the other versions. Trailhawk means that it has improved capability on:
- Water fording: The Trailhawk can cross water up to 48cm (20 inch) due to incleased electrical system isolation. Non Trailhawk are limited to 30cm (11,7 inches) due to more "exposed" electrical components.
- Manouvrability: The Trailhawk Steering system is diferent from non-Trailhawk. On the Trailhawk you have 2.76 turns (lock-to-lock), while on the other non-Trailhawk is 2.68. The resul is that on the TH Turning Diameter (curb-to-curb) is 10.76meters while on the others is 11.07meters.
- Clearence: The TH has better ground clearance due to a different suspension, as well as better attack and departure angles, due to different bumpers.
- Traction: Has a better final "Crawl Ratio" (20:1) due to a different rear axle (4,3 vs 3,7), that gives it more 20% torque on the wheels.
- Articulation: The TH has a different suspension with increased articulation: 21cm on the rear wheels and 17cm on the fron wheels.
It also has skid plates and, in Europe, a Diesel engine with 270 lb.ft of torque, although in Europe it doesn't has the front hooks because is not allowded
Regarding the 4x4 vs AWD, I just would like to add that the AWD on the Renegade always engage the rear wheels with 50%/50% when you come to a stop, for the car launch. As soon as it gets a few speed, it reduces the amount of power sent to the rear and at a higher speed. At high speeds, it disengages the rear axle. Note that in 4x4 Part time systems like the Wrangler, you have to use 4x2 on the asphalt/paved roads, while on the Renegade you have power on the 4 wheels even when driving on the road wich is especialy good on the snow and ice roads that we drive dily. In fact, the AWD sistem on the Renegade is so clever, that if the outside temperature is very low, or if you have wet conditions, it will be sending power to the 4 whells almost always.
In Europe the Uconnect 6,5 has the Jeep Skills app that shows you at each moment the power, torque and the % on the front and rear axle. If one wheel slips, it also shows you that wheel in red color! (among many other features).
Anyway, your Renegade will be able to drive you to nice places where to mort part of SUVs necar go.
Best regards from Germany,