'SUV' are big cars. Most are pushing 2 tonnes or more, so will naturally wear brakes out faster. That goes for all unsprung components such as tyres, bushings, and all the other wear items in the suspension.

Some cars are notorious for being under braked for their size, especially 'SUVs' that share platforms with standard sized counterparts so that contributes to it as well.

That said, brakes shouldn't judder/shake under braking during normal operation, even when worn. Juddering is due to something either not being right or very, very heavily and dangerously worn brakes. It may be warped disks/rotors (from cooking them due to overuse), pitting (if the car hasn't been driven much) or something else. The squeaking can be anything from debris caught between the pad and disk, a hard point on the pad or the wear indicator (called a squealer). The former 2 generally clear themselves out.

Without knowing how and where you drive or perhaps even the car itself it's difficult to say where the problem lies. A set of pads and disks can easily last 10s of 1000s of miles. But it depends on many factors.