It's very likely that the high pressure in the front tires was what made the Burb want to dart about. Factory recommended pressure should be close as the weight on the front doesn't very near as much as the rears. The trailer tires need as much air as possible and still maintain full contact across the tread, and the same for the drive tires.
"Using a ST225/75-15 D tire requires a 6.0" to 6.5" wide wheel pressure rated to 65 lbs. I'm guessing here but your old tires were probably a ST205/75-15 C with a 5"-5.5" wide wheel rated up to 50 psi or maybe 60 psi."
"Mounting a wide tire on a narrow wheel isn't smart and can do several things. One is the tires are riding on the centers of the tread and create tread roll just like the truck had.
Using low pressure isn't a good idea for tire on a trailer. Using lower pressures may let the tire tread sit flat but the cost is a hotter operating tire with soft/flexy sidewalls. We all know where that leads.
Tires should be fitted to the wheels width and pressure rating for best long term reliability. Especially on a trailer."
I didn't change tire size on anything. I stated that right off the bat. Only the weight rating.
I think Searching_Ut was on to something with the road conditions (grooved concrete) as well as probably too much pressure up front AND new off-road type tires all added up to the problem.
According to the door sticker it came from the factory with 245's and recommended pressure was 80 rear and 55 front for those.
* This post was
edited 06/10/12 02:46pm by CampingN.C. *
2005 Chevrolet 2500HD CCSB 4X4 6.0
2000 Skyline Nomad 3010
I'm not getting in the tire pressure wars. I'll just add that I bought new load range E's for my 150 last year and was a very unhappy camper for a while. I too was squirming all over the place towing. It was a very disturbing feeling!
My alignment guy (who is a local legendary alignment guru) told me with the Yokohama Geolanders I bought having no center tread wear groove that's solid, and the fact that the all-terrain tread was so deep and the rubber compound so new and fresh, my tires were like a hairbrush on the road, and they would settle down in a few thousand miles. After about 10K, they did and I'm completely satified with them now. Yours likely just need some time in service before they come into tune.
"It`s not important that you know all the answers, it`s only important to know where to get all the answers" Arone Kleamyck
"...An unarmed man can only flee from evil, and evil is not overcome by fleeing from it." Col. Jeff Cooper
Sunset Creek 298 BH
I just put new tires on my truck and trailer this week. My wife said the same thing that the truck feels weird when driving it now. I drove it today and it is doing the same thing. It could be the highway though. New concrete with all the groves. I set the tire pressure to 65 psi and it still looks over inflated. Good idea about using chalk to check the contact patch on the ground. Plus my kids will have fun coloring the new tires on the truck. I will be pulling the trailer about 120 miles think weekend. I'll keep you posted on how it feels. I have noticed that those new concrete roads with all the groves will cause my little cobalt to move a little bit.