Vince,No I did'nt load my R4's,I'm sure it works great I just tend to shy away from it mostly because of maintenance concerns.
The fel(1470) manual suggests a 750# ballast as an alternative and I did'nt want my tiller banging around back there anymore(its 650#).
I've been bringing alot of gravel up from the creek and with a 6' bucket it needs plenty on the back to keep it from getting squirrely...........Mike