Beachgirl,
If I remember right, I think you were getting a 38-foot Mobile Suites. As such, you will have the 17.5" wheels. Ours is a 38TKSB3 so it has the same. I went with the Kobalt from Lowes at roughly $95. It is capable of up to 250 foot lbs of torque.
When I researched, I was told to purchase a torque wrench where the range of torque needed was in the middle of the range of the torque wrench. Since the wheel lugs on ours are rated at 125 ft lbs, I wanted a wrench that went up to 250 ft lbs and the Kobalt met that need. It was also a lot cheaper than the 250 ft lb wrench at Sears. Oddly enough, while the paperwork says it has a one year warranty, the box it came in says it is a lifetime warranty.
I looked at both Harbor Freight and Northern Tools and didn't like what I saw as options, even though they were cheaper. My philosophy is that a cheap tool is just that. As such, a cheap torque wrench may get out of calibration.
Your owner's manual gives a procedure for torquing after changing a tire. On ours, one first torques all nuts to 20 ft lbs, then back off the wrench to "0" then set to 80 ft lbs and torque all of them again. Then back off the wrench to "0" before setting it to 125 ft lbs and doing the final torque.
As for tire pressure monitoring systems, we have one called nVISION and I'm not too pleased with it. However, I know of quite a few RV'ers that have the Pressure Pro system and really like it. I haven't heard as much from those that have the TST system.
Good luck with your traveling.
Terry
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Terry and Jo
2010 Mobile Suites 38TKSB3 #5332 - 2008 Ford F450
Terry's Smugmug Site
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