last time i did a major audio/video install was 3 years ago and at that time wireless cameras cost a grip and werent as reliable as a hardwired one.i dont think much has changed unless ur dropping well over 300. i recommend boyo brand,specifically their zinc plated license frame style.. ive had 2 and for the price its hard to beat. scooped them on amazon for less than a 100. if they rust/oxidize or the camera goes bad from washing or whatever u can get a new one and plug it into the old wiring.(it has a connector harness about a foot after the camera so u can detach it at any time)
removing a few trim panels along one side of the car shouldnt be that hard. its just a chevy..try removing reclining heated leather seats out of an infiniti (0_0)
anyway the most painful part is 95% of cars need to get a 1/4 inch hole drilled behind the license plate and filled with a rubber grommet to seal out moisture so u can run the skinny wires from the outside of the trunk lid inside.
and as for the video screen..i looked up 09 suburban but couldnt get interior pics i just found 07 and 2010 and 2011 models. you should go on a suburban forum and see if there are any add on kits that can convert your stock navigation screen to work with a backup camera. if you dont have navigation i highly suggest ripping out that double din and putting in a cheap double din dvd player. pioneeravh4200 is sweet and so is the jvc ax830 both about 450. if you were to buy just a standalone lcd, youd need somewhere to mount it(they sell these kits that has a mount wedged in between the plastic panels of the dash, i believe they use them for gps units) plus the standalone units are expensive for how simple it is compard to a dvd player and most have crappy quality.
for 450 you could have better sound,dvd capabilities, and options to add on bluetooth and navigation.
oh...and since you have such a hard time backing up i highly recommend installing a 4 zone reverse reverse sensor in conjunction with the camera. its worth the 200 bucks. cameras dont pick up everything and the fisheye lens makes it hard to judge distances. the 4 or 6 zone sensors pick up side and corner dangers too.