You sure can.
http://www.campway.com/products/snugtop/xuv/index.html
http://www.campway.com/products/snugtop/xuv/pictures/silver-avalance-shell-low.jpg
Yes it will bolt right on.
5W30 weight.
You can get the no-skid mats to put under a throw rug (2' X3', $3 at Big Lots) and put it under the top of your mattress topper. I put it under my husband's side of the bed, since he scoots on and off - and moves the topper more.
I have 33 in on stock 05 1500 avalanche rubs little when turned hard but work & look awesome.
Donkey kong
i have had 1800 pounds of sack-crete in the bed
The brake fluid on a 2003 Avalanche goes into the fluid reservoir. The reservoir should be bolted onto the drivers side of the firewall.
Yes, But it won't look right. 1988 is when chevy redesigned the body / changed it.
Yes to 1500 only
under the rear seat pass. side. jack goes in and tighten(jack up) slightly to hold in place
with a lift i have seen 44s but with out a lift... no idea just run with the stock size as you will get better fuel economy
There are a bunch of different manufacturers of truck bed toppers or truck bed caps, as they are sometimes called. If you are looking for a new topper I've put a link in the related links for an info page that should help. If you're looking for a used topper I'd call the manufacturer of the kind of used topper you are interested in and ask them what other tacoma model/yr toppers are compatible with yours. It might take a little while and a couple of phone calls, but it's a lot easier than trying to retrofit a topper that doesn't fit your tacoma to begin with.