Air Bag suspension for 92 pathfinder

[Toahk]

Hey guys, couldn't find the answer I was looking for, was hoping you all could help me out.

I have a 1992 Pathfinder, great truck, 229k on the clock and keeps going.
I use this truck with a hitch mount motorcycle mount and have a yamaha yz426 (275lbs) that I haul to the trail.
Problem is, I am basically sitting on the bump stops when I load the truck and have my gear in the back.
Was wondering what my options were to stiffen up the rear when I want to load up a bunch of tongue weight.
Have seen the "air lift 1000", but watching the video, they look pretty cheesy, unless you could tell me otherwise.
Any experience or advice you could pass along would be great, I don't mind spending the extra if there is a nicer air bag company, but my googlin' didn't turn one up.

Thanks!