Rear wheel spacers are on, they're totally solid! Thanks for the forum posts on these. $35/set on sale
(today, normally $56). They go on/off fast with an impact gun. Getting them started is easy by taking the extension off the impact gun, putting a nut/bolt in the end, then jiggling it as you hand start it to make sure it's not cross-threading (start all 5, then drive them in
lightly, then up the torque).
Steering the BX around turns is more difficult, so while the BX is much more stable on hills with 2"
x2 per side (4 inches total per side) the setup is really hard on the lawn and will have to come off for grass mowing.
The 80ft*lb torque stick measured in at about 70ft*lb of actual torque when tested with a torque wrench, so mu nuts are under Kubota's minimum rear torque specification by about 12%, which is my target since the wheels and spacers are being removed/re-installed every 3 weeks.
Do note the Kubota socket size for the rear wheels is 22mm so use those two nuts and three bolts first to hold the first spacer on. The socket for nuts that come with the the spacers is 19mm, don't use the 22mm by mistake.
OVERALL: Highly suggested if you need the extra stability spacers afford.