My TJM T3C front bumper is adjustable; I've adjusted it to minimize the gap...about 90% perfect. No way, within reason, to raise my Slee rear bumper. I'd like to do this because it'd get me a little more departure angle. You'd probably have to start either with a totally custom rear bumper or possibly go with the 4x4 Labs rear bumper kit and modify it accordingly.
Sliders...no real problem here. Again if you want to make yourself a custo set of sliders, as I did, you can tailor them to suit.
Do you know if the TJM T3 will fit on a 2005 lx470? I am about to install a body lift and I'm looking for a bumper to install. I noticed you said it's adjustable.