Well it does seam to confirm that the suction line is the problem. It isn't a long time cure to a hose that is coming apart. I don't understand how you had the time to rig this up but don't have the time to replace the hose?
I have been in your shoes running a single truck and trying to keep it running and my customers happy.
Am I to take it, by your statement that this was "the last hose" to be replaced, that you have addressed the other air lines? I doubt it is the "last hose" as there are so many on a truck. Did changing out the air hoses solve your drier problem?
I started stockpiling hose and fittings at my shop. I also got a parts truck that I could rob parts off of, either to use or to send off as cores for rebuild while my money make was still running. I am thinking things like a P/S box that required to be re machined for a seal to hold.
If you are going to run a single truck, you HAVE to be proactive with maintenance. The guy that picks up garbage, showed up in a different truck one day, I asked if he bought a new one, he said no, it was a rental while his was in the shop. I didn't know you could rent them, but I guess around here you can. Another possibility is if you know a "competitor" who will not "stab you in the back" that could cover a pick-up for you while you do a repair. I know, this takes a lot of trust, but there are people who will help out as long as you will when they need it.
Running an old truck as a single operator is difficult, Often it can mean being one big breakdown from loosing it all. that is why it is so important not to have multiple small breakdowns that could be prevented. Most customers will understand that everything breaks at some point. As long as it isn't common, they will live with a temp interruption in service.
I carried brake diaphragms, various hoses, filters, throttle return springs, etc so most minor failures could be repaired right where and when they happened.
Many small business fail when they failed to plan on a breakdown. A parts truck can be a true windfall of parts if you have room to store one.