My wife and I are considering a large toy hauler purchase, and I'm concerned that my stock tires
(which have a load capacity of 3525 lbs) will be dangerously close (or perhaps beyond) their rated capacity. I have considered going the Vision Hauler route (to maintain tire diameter) with 225/70R19.5 tires
, but that upgrade is damn near $3k (seems like a lot for a 900 lb increase in rear axle capacity).
As an alternative, I could get the same tire I have now in a slightly larger size
and get a limit of 4080 lbs and continue using my existing wheels. However, this tire's diameter is approximately 5% (34.3 vs 32.6 inches) larger than my current tires. Therefore, I'd be facing at least the following three potential problems:
1) Tire clearance. With stock suspension, would these tires cause any rub in the front while turning at full lock?
2) ECM calibration. The speedometer, odometer, and everything else will underestimate vehicle speed by 5%. How big of a deal is this? Is there any way to get the ECM recalibrated for these tires without voiding the warranty?
3) Drive ratio. Using these larger tires would have the same effect on gearing as replacing the 3.73 with a 3.54. Not exactly ideal since the goal here is to pull a heavy load. Have any of you pulled heavy trailers with larger tire sizes? If so, what was your experience (especially relative to the stock configuration)?
Thoughts on any/all of the above will be appreciated. Thanks!