2rz mobile detailing rig?

Hi all. Ive got a plan to do some mobile detailing to get a feel for the market before I invest in a shop. Ive got a 2003 tacoma 2rz that I picked up for 500 bucks, and it runs like a top... back to my detailing idea.
Ive figured that id be hauling around about 1400lbs of gear with me, including water, generator, pressure washer and all the other supplies. I currently have air bags, and I was looking at some helper springs as well.
When it comes to power, im not too concerned, I will be driving around town, and Its got the 5 speed manual.

I guess my question is, would 1500 lbs be too much to lug around for the axle/leafs? Also, should I throw on some 10 ply tires as well? Should i leave the water out, and stick to about 500-800 lbs? Ive hauled roughly 650 lbs with it before, and only sacrificed 5th gear going up the 8% grade on the way home.

Thanks in advance!