Who would like to see an Aluminum Frame or any other strong lightweight material with pneumatic tires for stairs that has an easy lift off recovery tank. Recovery tank could weigh around 40 to 60 lbs for hand carry upstairs or small portable collapsible hand carts, the main cart and solution tank could weigh 60-70 lbs or you could make the solution tank easy to remove also. A modular design but with solution tank instead of APO only, but APO an option. My Recoil at 90-92 lbs is still tough to get up stairs especially with one person and the weak handle. My Mytee at 130 lbs., M5, 153 lbs. even worse. I know there are some modular APO and Pump out units being made, but I like a solution tank for adding defoamer and chems. Large openings for recovery and solution tanks so you can put chems, sprayers, rags, tools etc, when transporting, with large flat top surface for boxes on top and hose. I load my recoil solution tank with all kinds of stuff and load boxes on the flat top when I have to hike in from parking lots in retirement homes I clean at distances from 600-800ft. I'd like a nice cart to push with most my stuff on and in it. Removable T handle to the front of the cart and second small cart attached to the back of the unit for vacuums, crbs, op, rotary, fans, etc. Anybody like to see someone build something like this?