Originally Posted by jcanavera
a. If it runs hotter, is it still a safer tire?
2. Will the current Airstream wheels (2004 model) allow a tire with inflation up to 80 lbs?
3. Will a 10 ply tire at 80 lbs. cause a rougher ride for the trailer than an 8 ply tire at 65?
a. 10 ply tires aren't 'safer' than 8 ply...
it's interesting this post and series of questions makes no mention of the tire brand...
it's your thread but that really doesn't help folks who search here by brand name and sorta adds vagueness to the issue.
so it seems maxxis st radial tires
is the focus here, not LT tires or true bias ply tires, other brands?
to begin with these maxxis tires aren't 8 or 10 ply. both of these maxxis st radial tires are the same number of plys.
that is a term used to compare the load rating to more traditional (really old) bias tire construction.
maxxis does still offer bias ply tires but only up to 6 ply.
higher pressures shouldn't result in running at hotter temps.
tire temps climb as a result of load, braking, roadway friction and temps, and side wall flex from under inflation.
yes the 30 slide is the heaviest thing on 4 wheels but much of that extra mass is tongue weight.
how much is your tongue mass? 1000 lbs, 1200 lbs or more?
so without actually weighing each of the 2 axles (or each wheel) and the tongue, this is still big time guestimation.
the actual wheel loads may be as little as 1700 lbs or a more reasonable 2000 lbs?
your alcoa forged 5 spoke 15x7j wheels are rated to 95 psi, so YES they can handle 80 psi...
but these rims are only load rated to 2200 lbs
i don't fear wheel failure (i've got 9
of these rims alcoa rims) but they are really really light!
using tires that exceed the wheel rating by several hundred lbs isn't usually wise...
and won't increase the single wheel carry capacity of 2200 lbs.
the '8ply' equivalent tire is rated to 2500 lbs or 10,000 lbs with 4 evenly loaded...
so nothing is gained by opting for the '10ply' 2800 lb tire on a 2200 lb rated rim