You can do this two ways.
I have a Schrader valve in the gas fill area and I pump them up when I know I'm going to need them. 25 PSI max for mine. My son has a power wheelchair, so when I carry it, I have a 125 LB wheelchair rack, then the wheelchair is an additional 400 LB, so I have 525 LB hanging on the rear hitch of my truck, about 18" from the rear bumper. That's over 1300 LB-FT of torque past the rear axle.
That's why I have heavies AND air bags.
When I'm done, it's like letting air out of a bike tire. Yes, you COULD literally use a bike tire pump to get these pumped up.
Another way for the air bags is AirLift sells a pump kit with a remote (about $1000 USD) that you can install and you choose a pressure and forget it. It will keep it pressured accordingly. I installed one of these kits on my wife's Van since that carries the power chair most of the time. Before she loads the WC, she pumps up the bags, then loads the WC and and away she goes. When she's done, she unloads the WC, then pushes the button and it deflates the bags and off she goes.
It took me about 3 days to install these on the van, but that's because I had to remove a bunch of the interior to place and wire the pump. You can't mount the pump under the hood or under the vehicle because of heat and weather. It's a bit noisy inside the van when it cycles.
On my LC, it took me about 3 hours to drop out the rear springs, remove the interior bump stops, install the bags and tube them up to the fuel filler.
I bought all mine from Summit Racing because of cost, but IDK what or where you can get in Ecuador.
www.summitracing.com
