You need to know the towing capability/weight of the Wrangler and also the weight (empty/dry and total max load) of the camper you are considering.
What I can find says the standard Wrangler only has a towing capability *MAX* of 2000 lbs. That apparently depends on the year & model you have and if you have the towing package. Explore Jeep Capabilities | Towing Reference Guide | Jeep
**EDIT... I did notice a tab where there are some Wrangler models (on the "Unlimited" tab in the above link, that have tow capacity up to 3,500. If you have one of those, then an A-Frame would be within the capacity. ***
The smallest A-frame that I can find on the Forest River website is model A 102. It has dry weight of 1,666 lbs, max weight fully loaded of 2,415 lbs.
Even empty, and assuming your jeep has the 2,000 lb towing capability, that would be maxing out your vehicle. The towing capability is calculated assuming NO cargo in the jeep and only 1 person of 150 lbs. Add gear and a 2nd person and a full tank of gas, and you are over the 2,000 lb towing limit.
If you have the jeep model with only 1,000 lb towing capability, then I personally wouldn't use it to to any travel trailer. I don't know of any traditional TT that is less than 1000 lb. But, let's see what other say...