acutally on 4" lift and 33's, you cant see anything lower than the dash. well, unless your taller than 5'10. /forums/images/graemlins/crazy.gif
Dark tint helps a lot. I use almost fully black limo tint on the sides, and will probably use mirror tint on the back at some point. I use a very very light tint on the front two windows, not dark so I cant see anything, or would get a ticket for, but something just to possibly break out the outline of anything valuable. Proximity alarm systems are pretty good for general deterrant theft.
Collar lock, cut off switch, + auto lock= make trucks extremely safe from being stolen. Not to say that someone couldnt come by with a plasma cutter and get through all of that, use a 12v battery and tap the fuel pump wires , or come by with a flat bed...
If your really serious about securing your rig (in the rear storage area) you can do what they do here in NYC for the Press Equipment suburbans....
They build a steel cage around the interior and pad lock it. Even if you get through the outer barn doors, there is still the annoying steel cage to contend with. Im sure you can use lock cutters and what not, but the common thief wont have the time, patience, or resources to deal with it.
Stickers help too, but your assuming people can read. THe shotgun racks help ( I have a double holder mounted on each side, and honestly doesnt even hold my shotguns very well, but does a darn good job of holding a shirt, hat, and my fishing rods), but I would rather people NOT be able to see into my truck period. I prefer to have the look that I might possibly LIVE in my truck. Which of course, might just scare them the most. /forums/images/graemlins/smile.gif
There is also a lot you can do about lighting- park in an area that has light, but also has a lot of light which is directly overhead, rather than at an angle. This allows your truck to be illuminated, but not illuminated on the inside.
Some of these car alarms are quite advanced nowadays, with 1 mile range. They tell you if the proximity has been set off, if there is glass vibration, if someone popped your hood, if the engine is started, if your lights are on, if there is a weak or serious impact to your vehicle, and of course, remote start. Their reasonably priced (100-200 dollars, maybe 250 if you want the super duper siren. I've found some good deals on asianwolf.com