Towing with my 35D- load leveling?

[spyro235]

On saturday I'm likely going to be towing about 5500lbs a bit over an hour away. I'm still super nervous, being that I don't have the self leveling suspension, and know it's going to be squatting like crazy with 500-600lbs on the hitch.

Everything I've looked into says that retrofitting the SLS is near impossible, because the car's not wired for it if it wasn't optioned for it. I can't really find anyone that seems to have fitted any aftermarket system either- Vague mentions of doing arnott bags, but with a standalone pump. I'm trying to find out if this would be possible. Can anyone point me any direction?

I'm going to do a nice suspension refresh sometime soon on the front, and would love to do the back too, but want to consider making the vehicle more tow worthy. It's got the rating for 6klbs, and I do plan on driving it some decent distance at around that weight. I've had 2300 lbs behind it before and it was great, barely noticeable.