Leveling Kit info

[str088]

Hey guys just wanted to know some info on leveling kits.
First off I wanted to know what is the usual cost of having
the leveling kit installed, what a good deal is and what a bad
one would be? I understand that costs differ from state to
state and city to city; what I'm looking for is more of a general
estimation.

Second what brand of leveling kit would be a reliable product
to buy from, from experience and reputation? I heard "airbags"
were great but I'm afraid that the heat here in Vegas, the
extreme weather in general, would affect it. So I'm leaning more
towards the spacers, but would like info on both.

Next I wanted to know which space 1" to 2.5" would give the
best flush look, I have a tonneau cover that I think has some
substantial weight so I don't want a sag. I would like either a
1.5" to 2" but am considering 2.5" if it is much straighter compared
to the others.

Are there any downsides to having a leveling kit? Once you have
the leveling kit on what else do you need to maintain the integrity
of the vehicle? I understand that after leveling a vehicle you need
an alignment, but are there any other things you need to do?

Thanks for the future comments and I'm always grateful for all the
help that you guys give, thanks again.

PS I have a 2wd dunno if you guys need anymore info.