As long as Skynet is not hacking your jeep I you should be ok. I pull a 21' 3,500 lb travel trailer allot. With regular cruise control there is limited engine breaking. I have had it sport mode going down a long grade and had some high tran temps and had to go back to auto setting to let it cool. with a smaller displacement engines with fuel saving valve settings engine braking will be an issue. more of a beware of the conditions and take it easy down those grades. A mix of breaks and down shifting and slower speeds will be the best way to handle steep highway down grades with a load.
"The Jeep, the Dakota, and the Landing Craft were the three tools that won the war." -- Gen. Dwight D. Eisenhower