From a fellow WJ owner who has towed many types of campers here is what I would suggest.
First this all assumes you don't wheel the GC very hard or need tons of flex. I would replace the stock coils with a set of Old Man Emu heavy-rate springs front and rear. Will lift the jeep a couple of inches which is good as the trailer will bring it back down. I would install an Addco rear sway bar as previously mentioned. I would then install a set of Bilstein HD shocks all around, and finally get a proportional brake controller. Ensure your brakes, axle fluid and t-case/trans fluids are all clean and topped off. Being 24-feet long, I will imagine the empty weight of the trailer near 3K lbs with a gvw near 5k or slightly higher.
For a trailer that size, a weight distribution hitch will be almost a necessity and with sway control will make the jeep a lot less stressful to tow with. I ran this basic setup and towed my 22-foot camper from AZ to WI without issue.
Hope this helps.
'78 Cherokee Chief: 360/TH400/NOS QT, '04 Grand Cherokee: 4.7/545RFE/242HD w/SYE, JK Rubi front axle, 4.56 gears, Protofab rear bumper/tire carrier