OK. Three quads with no garage. That's not my field of expertise for toy haulers. We've always had a garage. If you are hauling utility quads, that means they are highly unlikely to fit in there side by side. But you can turn them sideways if there's room.
The only thing I can remotely guess is the brand I currently have but a different floorplan. That's the Work & Plays. They're tough as any camper out there, come in some huge cargo areas, but lack the "fanciness" of some other haulers. They're made for what we do: show up at a track out in the middle of some farmer's field, set-up, and live the weekend in it for the races. We race ATVs in an XC series.
Scroll down this link to the travel trailer toy haulers. They have some big cargo areas.
Work & Play