Have you weighed your rig? I weighed mine the other day and found that my axles are more than adequate. for the rig. You have 3 6000 lb axles for a total of 18000 lbs. Even though your rig is heavy you are, probably well within your axles ability. Go weigh them each axle and see what you get. BTW, the internet is full of used axles, they are cheap (inexpensive), even new ones are cheap. Go to dexter axles website and look at the 6000 v 7000 lb and you will be able to identify the difference. I have not done it but I bet that hte only difference is the hub and bearing.
Another alternative is to go to a spring and axle shop and tell them that you want to put larger axles and bearings on your rig, without removing them they will cut the weld and insert new axle stubs in the housing then you can either get new hubs or install different bearings and races.---just sugestion
is it possible to order 3 7000lb axles instead of the standard 3 6000lb on a cyclone with the g114 tires of course ?