Where is the RVNet expert, Lars, when you need him? Doesn't he know these things? Cousin Eddie eats squirrels, Lars knows weights & towing capacities.
ON EDIT: I originally edited this post on 1/9/2011 at 6:17AM at the direction of a moderator to remove what was considered a sarcastic/argumentative statement in the first line of the original post which I did so the post shows as it reads now as of that 1/9 edited date. I have added this comment because of some information provided to me that seems to say I would post something not so nice and then go back and edit it to make myself look good and that is simply not what happened at least here. I now wish the mod would just have deleted the one sentence like I did so this would never have been an issue, but hindsight is .... Oh Well.
There are a host of factors to properly marry a TV to a specific TT. I'm not sure we can address them all, but below are a few of my thoughts ....
1. The critical numbers you need are GVWR of both the TV and TT, combined AWRs for the TT, RAWR and FAWR of the TV, and the GCWR for the tow vehicle. Sometimes you can bust the GVWR of either the TT or TV by a few hundred lbs as long as you stay within the AWRs (axle weight ratings)
2. I would recommend you stay to no more than 80 to maybe 85% of the TV GCWR, especially for a vehicle that old. I personally would use the GVWR of the TV minus 80 to 85% of the GCWR to determine the max GVWR of the TT you should be looking at.
3. Before even looking at a trailer you need to load up your TV like you would when towing with all passengers, cargo, and get it to a CAT scale and get the individual axle wts.
4. I haven't touched on the TV or WDH/Sway system, but those have to be considered and the point about the poor quality of the OEM round tube receiver is know and I would address that before towing with a GM product like you have.
This is just one forum with a few members and you should expand your search for the knowledge and experiences of others and RV.NET is another resource which has the same pitfall of this forum only not so much IMO, but not the only one.
Larry