I did a quick search for 285/75R16 tires (metric 33's) and only found one with a C load rating, the Toyo Open County C/T which does not look like a good choice for a jeep.
I found 6 D load rated tires in that size: the Pirelli Scorpion, Maxxis Bighorn, Nitto Terra Grappler, Pro Comp Xtreme M/T 2, Interco Irok ND and Interco SSR.
One of the reasons there are so few C and D load rated choices in the 285/75R16 size is that this is one of the most common sizes for 1/2 and 3/4 ton pickups that require an E load rated tire in order to support the load these vehicles are designed to carry. Consequently, there are at least 67 E load rated choices in the LT285/75R16 size.
See:
Tiresize.com
Although some are quick to opine that C load rated tires are the only "proper" choice for a TJ and urge you to buy a new set of 15" rims and go to 15" tires so that you can find a decent selection C load rated offroad tires, my observations over the past several years have been that the selection of 15" offroad tires is diminishing, the selection of 16" offroad tires has remained static, while the selection of 17" offroad tires is increasing. That is why I often say "
17's are the new 15's," which is not surprising since TJ's with 15" and 16" wheels have been out of production for 13 years with the subsequent JK's and JL's and many pickup trucks now being equipped with OEM 17" wheels. Tire and wheel manufacturers go where the money is, and that isn't the 15" rim size.
If you are going to consider new wheels, you would probably be better advised to go larger rather than smaller. There are a handful of C load rated 33" tires in the 17" rim size and many good choices for D load range 33x17 offroad tires.
That brings me to my final point: don't be too quick to discount all D and and some E load range tires regardless of the rim size. Some tires of the same load range are stiffer than others and ride quality and offroad performance also depends to a great extent upon how heavy your rig actually is and the inflation pressure you choose. See this post for further discussion:
https://wranglertjforum.com/threads/are-you-guys-sure-about-tire-pressure.19750/page-3#post-320974
Best of luck with your tire search.