Automotive TPMS for your Trailer Tires - TUSON TPMS4W - The Best TPMS for Your RV or other Trailer?

Accurately knowing your real-time tire pressure for your trailer can prevent a tragic trailer tire blow-out. Today we install the in-wheel/internal Tuson TPMS (Tire Pressure Monitoring System) in our RV. An internal TPMS operates just like your car giving you accurate, internal readings of your pressure, however, this also gives readings on temperature. But this unit can be installed on any towable - heavy or light duty and up to 10 tires. Is this TPMS up to the task? Let's find out!
PLEASE NOTE: I am not currently sponsored by Tuson. I paid my own money at full price to purchase this unit. Tuson does not have foreknowledge that I created this review.
Partial Transcript:
Get rid of those annoying external TPMS screw-on sensors because finally there is an entire in-tire, in-wheel? In-the-tire, internal TPMS system for your RV (or other towables) - And that’s what we’ll be reviewing today!
Let’s face it, these screw-on systems are an absolute pain. Sure, there are some really nice and expensive versions, but when it comes down to it. It must be a long labor of love because to get these things off, you gotta work on it just to fill or even double check your tire pressure.
There are flow-through tire sensors, but those still have their disadvantages including the obvious added stress to your fragile valve stem if they ever get snagged on anything.
I picked up this in-tire TPMS from Tuson. There are other variants for more wheels, but this model is the TPMS4W - 4 standing for 4 wheels or trailer tires.
This model claims to display, of course, tire pressure, the temperature, and…. for some unknown reason, the battery voltage.
Let’s take a look at what’s in the box.
This is the display, also known as the Tire Pressure Monitoring Receiver or Tepmerbla for short. Here is the receiver antenna on the back. It’s light but has nice grippy ridges around the side which makes it feel like a better quality unit.
This is the windshield suction cup mount.
Here is a bag that contains the repeater, mounting hardware, and the sacred owners manual.
Here’s the 12V power adaptor.
And, at last, we have the Creme da la creme - the in-tire sensors and valve stems. Let’s lay them out and have a better look.
If you’ve ever seen your pressure sensors from your car, these will look familiar.
This unit is generic enough to handle a couple of different ranges of wheels - covering wheels that have the 0.453” valve stem hole opening and a much larger 0.625” opening. The kit has the valve stems configured for the larger 0.625” holes, so we’ll need to reconfigure the valve stems with the smaller hardware.
Here’s some decals to keep track of which sensors are in which tires.
Right away we can see the instructions on how to correctly assemble the valve stems.
These instructions are well written - so none of that horribly translated text nonsense.
It reads “Each sensor has a unique ID# to identify the sensor to the receiver. So we’ll have to take care on our install order. It also says that the battery life is about 5 years when driven about 4 hours per day. There is other important data, so be sure to read through this thing before installing on your tires.
Let’s go ahead and get these valve stems setup for our application. We’re going to assemble for the 0.453” hole. If you’re note sure what your specific RV takes, a good tire installation center should be able to help you understand which stem size you need to account for.
These seals are a bit hard to get off so you really have to work at them to get them free.
And we’ll assemble the other hardware. There we go, one down, three to go.
Alright, let’s get going on the install!
Begin TPMS install montage.
Note here that we’re marking each tire with what sensor is installed on each.
Now repeat three more times.
Note that we are installing a set of Goodyear Endurances, but also note that we have balanced our tires, something I have done for years to help protect against unwanted vibrations transferring to the trailer.
Begin repeater install.
For travel, cargo, and other bumper-pull trailers, the manual specifies that the repeater needs to be installed in this location. It doesn’t say that we can install it in the storage compartment unless the application is for a 5th wheel.
So we’ll install the repeater in a centric low line-of-sight location on the exposed underside of the trailer tongue. Note that the repeater is waterproof.
On my particular model, I don’t really have any good options to just stick or screw this thing into. Hmm.. also want to keep this close to the battery to prevent having to run the wires too far.
I think our best option is to install under the battery tray, but we’ll need a sturdy way of mounting this here. I have an idea…
Let’s do this!
I’ll use this stainless steel plate to give us enough surface area to work with. We’ll simply cut this to fit.
Begin steel plate montage.