Bulk gasoline for a fleet that still runs both
Diesel runs the heavy iron. Gasoline still runs pickups, pumps, and small engines. Bulk gasoline is a delivery into a gasoline tank, not a gas-station price.

Say which tank is gasoline
Gasoline, ULSD, and dyed diesel do not share a tank. The note should name the tank and the gallons. A diesel-only wagon will not add gasoline because the site is busy. The gasoline filter exists so the list is companies who say they deliver it.
Retail pump prices are a different search. Bulk Fueling does not map stations and does not post street prices. If the trucks can leave the yard, a cardlock may be the simpler buy. If the fuel has to come to the site, use the quote.
Do not bury it under a diesel order
If gasoline is the product you are out of, select gasoline. Mention diesel in the notes only when that same distributor sells it. Two specific quotes are easier to answer than one email that says “and some gas.”
Small engines and light plants on a construction site are a real gallon count. Put the number in the form so the minimum can be judged.
Questions
Is this for finding cheap retail gas?
No. These are bulk distributors. Street prices belong on a station search.
Can gasoline and diesel arrive on one truck?
Only when the distributor agrees to load them that way. Ask. Do not treat it as the default.