My first job was establishing credit for businesses applying for in house credit accounts. You are correct, normally we would require at least 3 trade references. The gas company (gasoline for their fleet vehicles), a uniform vendor, that kind of thing. Whatever they offered as a reference.
Back in the day you could actually call and talk to people and get good details, but now I believe most of them will require you to send a form over for them to fill out, and they MAY fill it out and send it back. They will REQUIRE a signed release by the applying company saying that the applicant authorizes the release of their credit information. It's fairly generic and you could make it up in a few minutes.
Even with the release in hand, they may barely fill it out. They are under no obligation to do so. It just depends on how generous the reference is with their time that day.
Usually what you are asking for is the credit terms that they have with the vendor. 10 day, 30 day, 90 day? Total credit limit. What their average and/or high balance is. And most importantly, how many times have they been late and how long. Your form you will send them will have blanks for all these items. Also have they had to do any collections (beyond in house). This would be yes/no.
There is nothing magical about asking a business vs asking a previous landlord. In fact, if this is a company who is doing this routinely, I'd ask for their other landlords they've done business with as their trade references. That will be a better reference than the gas company. My experience was they ALWAYS paid the gas company because they couldn't shut the fleet down. But they'd stiff you in a heartbeat because what are you gonna do about it? Get huffy? Businesses are really good at ignoring small time vendors and paying when and if they feel like it. However, they generally do pay better than people because you are dealing with a professional, as in there is an accounts payable person whose job it is to make sure AP gets done on time and deal with the calls when it isn't. Just hope the AP person isn't the owners wife. That was usually 90% of the problem when I had a problem in collections. (I also did the collections and field collections if it went really bad.) I'd show up to get our money and the wife, who'd been avoiding me and/or telling me they didn't have the money for 90-180 days, would have a brand new car in the driveway.
As far as getting paid, I'd rent to a company before I'd rent to an individual. I just need to know the company, which you are finding out.