Is the Beck tube frame open on the bottom to accept the tow bar? That's the first question you need answered. The other question is distance between the frame tubes. You probably will need a narrowed bar and possibly a lengthened one as well.
I personally wouldn't flat tow with any vehicle that has a tow rating of less than 2500 pounds. You need really adequate brakes when you flat tow.
I had a local fab shop weld mine up from a VW bar. It was narrowed, lengthened, and lowered. They make certified cages for race cars, so quality is there. It was built safe and sturdy.
I flat-towed my 1500 pound Spyder THOUSANDS of miles with a Legacy GT wagon, a Passat 4-motion wagon and a V8 Allroad. I towed to and from Carlisle, a 500 mile round trip. I flat-towed all the way to Maggie Valley and back in 2018, a 1500 mile round trip.