I have a Agri 40" behind my BX2660 and it works great. No problem with tire tracks , I just offset it to one side and do a rototill pattern in garden etc that keeps me covering previous track.
If you can't afford going bigger, you will still be happy with a 40" , and it is lighter if you need to horse it around at times to connect or move out of way in storage area.
It does my 30 x 30 garden in 15 minutes , I guess a 48 " would do it in 13 minutes.
jake