You want a towing vehicle with a tow rating higher than the weight of a trailer when fully loaded.
I'm not certain how much but I would look for at least a 1000 lbs higher than a fully loaded trailer. In some cases a vehicle rated to tow "up to" 5000 lbs is an exaggeration. Vehicle may be able to tow 5,000 lbs but only shorter distances. More realistic towing weights for some 5,000 lbs rated towing vehicles is between 2,000 and 2,500 lbs, at 3,000 lbs towing becomes more difficult at 5,000 almost ridiculous unless perhaps the vehicle has been modified.
Also required is a tow package. Take a look at the specs on the tow package. A good tow package will have an upgraded heavy duty radiator with a heavy duty external transmission cooler (that's not part of the radiator cooling) (automatic transmissions) make certain the transmission cooler is rated high enough for your towing needs. A good tow package usually comes with upgraded tires and suspension (tires, shocks and springs). Spring and shock ratings are important for when towing and hauling.
Trailer towing requires a good trailer brake system installed in the tow vehicle, can make a difference while towing.
Weight Distribution Hitch is another consideration when towing. E.g. some smaller SUV's have a towing rate of e.g. up to 5,000 lbs but only when using a WDH (weight distribution hitch) Otherwise a tow rating may be only up to 2,000 lbs.
Shorter wheel base vehicles normally aren't as good at towing as longer wheel based vehicles. There also more difficult to upgrade with larger tires and hd suspension and not as good with bumps, dips, etc especially when towing a trailer.
I have towed with earlier model Jeeps and not familiar with later models. Of most of the different Jeep models Jeep Grand Cherokee in comparison ranks fairly good for towing up to a certain weight(s). However I'm not certain of the later models. Some of the later models SUVs aren't all that good for towing and off-road. A few of the small SUV's no longer can be lifted for use with larger tires and heavy duty suspension because of changes to the design of their steering, suspension and engine mounting. However some Jeep SUVs have seen significant improvements with the engine, drivetrain and transmission. Jeep iirc has started installing five and six speed transmission replacing previously installed four speed or three speed with a 4th OD.
The Jeep Grande, find the hitches Class rating. Class III is normally the most popular hitch installed. The Class IV are usually installed on larger vehicles such as large trucks, etc. Though there are some very heavy SUV's heavier than some larger trucks.
Looking online I see the Jeep Grand Cherokee 2014 is rated to tow up to 5,000 lbs. Which is the same as the older Jeep Cherokee XJ that first came out back in the 80's produced mid 80s to 2001.
Most likely it has a Class III hitch but the vehicle is only rated to tow up to 5,000 lbs. Swapping in a heavier duty hitch won't increase the tow rating or GVWR of a vehicle which is there for life, unless changed by the vehicle manufacture.
There are differences in tow capacity ratings and GVWR. The GVWR isn't ever suppose to be exceeded even when using modifications and towing equipment. Most of the towing equipment helps facilitate towing but doesn't usually change a vehicle's GVWR, unless include perhaps some design and structural changes by the manufacture.
Look also for the Grand Cherokee's hitch class rating and if it requires WDH equipment to meet a max. rating
* I would go online to one of the Jeep Grand Cherokee forums and search towing with a grand Cherokee. Possibly join a GC forum and post a GC towing question(s).
It's also a good idea to find the tw (tongue weight rating) which helps when making towing calculations. A higher TW allows for more weight in the rear of a vehicle.
Class III hitches used as weight carrying are rated up to 6000 lbs. gross trailer weight (GTW) with a maximum trailer tongue weight (TW) of 600 lbs.
Class III hitches used for weight distributing are rated up to 10,000 lbs. gross trailer weight (GTW) with a maximum trailer tongue weight (TW) of 1000 lbs.
Class IV - 2" receiver 6,000-10,000 lbs (load) 600-1,000 lbs tongue weight