Looking to replace my 5 year old tthp 48". Going to go 52" in either the turf tracer or the turf tracer hp. Is there any difference between the two except horse power and tire size? I was thinking the extra horses would be good because I use the sulky often and I also do some light field mowing. Is the bigger machine as maneuverable and does it hold to side hills as good as the tthp? How much more should the turf tracer cost, and is it worth the extra? Thanks, Reg.