Im looking at getting some Weld Pro Stars 15x10 with 5.5bs. Also looking at getting M/T 28x10.5x15 tires. Im looking at running around 14-15 psi maybe as low as 12-13psr. Do I need to install tubes or can I run that kinda air pressure without tubes? And what psi do you guys recommend? I should be launching on a t-brake. Thanks!