I bought a 2015 Cougar Lite. It has 4400 lb axles under it. The brakes are ok under normal driving with the gain set at maximum. One panic stop would let me wanting more.
4400lb axles have the same size brakes as the 3500 lb axles although they claim the shoe material and magnets are different. It is not good enough for me. The 4400 lb axles have no options for brake like the 3500 lb axles or the 5200 lb axles. No auto adjust, no hydraulic drum, or no disc brake options. I got a price of $280. for a complete 5200 lb axle with disc brakes. Rather then spending money for new shoes I've decided to make the switch, $560 for two plus actuator and lines. This will only be my 4th trailer I've converted to hydraulic, second to disc brakes. The 5200 lb axle also has the same size brakes as the 6000 lb axle. The Chinese tires are rated over 5000 lb so I should be good to go with reserve capacity on a 9500lb 5th wheel.
An added bonus... while on a cross country if a bearing goes parts can be picked up at most farm equipment store or TSC.