Tpms

I've had our TST system installed for about 5 years. After doing a bunch of research before buying, I also had installed metal valve stems on the rims - easily available from NAPA auto parts. Not a problem since day one and they've performed well.

I installed a 507 system after discovering a flat trailer tire when arriving at the campground. Luckily no blowout, and I think I checked the tire pressures at the start of the trip (usually do anyway). The tire had a big staple in it.

Since then no issues. It hasn't saved us from disaster or anything like that.

But what I love is no longer having to manually check all my tire pressures.

I've been using the RV507 system for about 3 or 4 years now with rubber valve stems and haven't had any problems with it. I did however, need to install a repeater because of the overall length of my TT. I also change out the batteries in the sensors annually.
The system has saved my bacon twice by letting me know when a tire was going down.
I wouldn't leave home without it.
Happy camping!

Main point is that Crosfire will give you the benefit of
-equalizing the pressure
-saving one TPMS
- extra visual monitoring
-high quality materials.
Whenever extender will match materials quality is another story, but but those I have seen mounts with clips, that not likely will hold weight of TPMS on them.

Kayteg1 wrote:
Comparing Crossfire to valve extenders is like comparing manual transmission with automatic.
It is hard to find really good description, but in case of blow-out Crossfire will close good tire after small pressure drop.
Question is what will the central indicator show, the slightly drooped pressure of good tire, or 0 pressure of bad tire.
Either way you will have some pressure drop indication.
I am strong believer in back-up systems and visual indicator sure makes good back up

Hmmm, let's see now. An inner dually valve extender is typically a hose screwed onto the valve stem that extends to the outer wheel where the tire can be filled more easily. A Crossfire on the other hand, has two hoses, one connected to each valve stem in the pair, extending to a central fill point where both tires can be filled at once from a single valve. Yep, that sounds a lot safer to me than one hose. ;)

Unless your TPMS monitor trigger point is set so close that it will detect the small pressure drop before the check valve closes, you won't necessarily have any idea that a tire has failed until it completely blows, potentially causing significant damage. At a local truck shop where I've had work done for years, the tire guys see it happen often enough that they have a large box full of discarded Crossfire units.

Comparing Crossfire to valve extenders is like comparing manual transmission with automatic.
It is hard to find really good description, but in case of blow-out Crossfire will close good tire after small pressure drop.
Question is what will the central indicator show, the slightly drooped pressure of good tire, or 0 pressure of bad tire.
Either way you will have some pressure drop indication.
I am strong believer in back-up systems and visual indicator sure makes good back up

Equalizers are basically two valve extender hoses connected to a single inflation point. The problem with having one sensor for two tires occurs when one tire fails and the equalizer's internal check valve isolates the remaining tire. The TPMS sensor still "sees" the pressure in the good tire, with no indication that the other one has failed. Crossfire at least, does offer an optional hose setup that allows individual sensors for each tire.

Valve steam extenders is just one more thing that can fail and they do have relatively high failure ratio.
IMHO the best for duallies are pressure equalizers with TPM on top of it.
This way you can use single TPMS and have visual confirmation.
On my 2017 Ford I already had 2 TPMS replaced due to leaks and 3rd now is showing 20 psi above the actuall.
Full service spare has no TPMS, so I either waste $400 tire, or use it without sensor.

At the risk of reviving a dead thread:
Being new to the RV side of camping and the relatively new owner of a B+ I have a ton of questions and TPMS is at the top of my list.
Our 22' B+ has duallys and I want a dependable TPMS and am looking at the TST507. My question is, can I use these with valve stem extenders? If so which are preferred? And after installation rebalancing is recommended?
It's getting harder and harder for me to get up and down, much less reaching in to precarious positions. Getting something up in the open would be great.
Any and all info would be greatly appreciated.