Look into putting air bags on the rear suspension of it. See what’s available for capacities and go from there. I had 10,000 pound bags installed with the connection points in the rear bumper licence plate top bolt holes. Keep in mind this was a truck but I kept a Milwaukee 12volt compressor under the back seats and it had no issues putting 100 pounds in them. I think it cost 750.00 installed at the dealership, was cheap not having the compressor built in. Ran them at 5 pounds when I wasn’t towing, wouldn’t know they were there. I would tow 15-20k pounds and that’s when I would put a good 80-95 pounds in them and it would level the load right out.