Am assuming the OP is now talking about his 'new' 2500HD (fake 3/4 ton,
it's a 1 ton)
This is a higher class truck than your half ton. The 'HD' suffix takes
it into 1 ton territory
The truck is heavier just sitting there with nothing loaded in/on it
Notice where the half way point is...on most TV's it is at the drivers
door's rear edge.
Meaning most of the stuff loaded in/on it will have 'most' of that
weight on the TV's rear axle
Then that this is several thousand pounds more in initial weight
and capacity...it will need higher class tires than your half ton
and need more PSI
You need to change your half ton metrics (+6K-7K GVWR) to your new
+9K GVWR truck's metrics
On the spare...do you know which tire position will need it? No one
does, so air it up to the max any one of the four on the ground would
ever have...if it goes to one where it has less PSI...just let out
PSI...much tougher to air them up out there in the boonies...
-Ben
Picture of my rig1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...