Wow -- that Befco is ~$1600 for a 6' unit. I have a unit I found on Craigslist for a $100. It's not a finish unit, but would work well with something like a roller behind it. All it is a piece of tool bar (~2-3" square stock set at 45 degrees -- diamond shape when looking at the end) and some 'C' tines attached to it, then a pair of trailing arms with implement wheels as gauge wheels. One could just go to the junkyard and get a front wheel drive car rear axle and use that instead. Or use a roller assembly of some sort.
But it sounds like you are looking for a ready made solution.
But it sounds like you are looking for a ready made solution.