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Old 02-20-2012, 07:44 PM   #1
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Sunpass Transponder in a Class C

I've been reading several posts about the SunPass and where to mount it on a MH. Though the post's I've read so far are all from Class A owners. I have a Class C MH and just bought the SunPass and registered it about 2 hours ago. We will be on a trip starting this Wednesday and I'm wanting to make sure that I mount this thing correctly.

I already mount my GPS unit onto the Left corner of the Windshield next to me, and I'm thinking of mounting the Sunpass transponder about 2 to 3 inches from my dash just in the middle of the windshield. I have a rearview mirror that I occasionally use and don't want to mount the transponder on either side of the mirror as it would distract me big time.

Is it okay to mount the Sunpass transponder in the middle 2 to 3 in above the dash in a Class C MH?

Thank you,


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Old 02-20-2012, 09:22 PM   #2
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For those that don't know what a Sunpass is... like me... I googled it... It is a toll road device for Florida

Ronnie (WD5GIC) & Jan (WD5IHU)
2003 Monaco Dynasty Countess 42' w/tag, 2012 Ford Flex

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Old 02-20-2012, 09:30 PM   #3
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The preferred position is at the top of the windshield near the center. Do not place it behind any metallic sun shield film.

2007 Presidio 39D

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Old 02-20-2012, 09:32 PM   #4
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We have EZ Pass in the northeast and mine worked fine in the upper center of my class c. As above, don't get it behind any tinting and it should work fine.
Neil, Lin, and our furry companions, Ashby and Cody. 06 National Surf Side.
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Old 02-20-2012, 09:35 PM   #5
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you'll know if its right because it beeps at you .. well, at least mine
does. (most times, seems some places it doesn't beep)

Just make sure the proper license plate info is associated with that
transponder and if it "misses you" the camera's won't miss and the
translation will get done automagically
2004 Itasca Sundancer 30' Class C
sometimes seen pulling 2010 Jeep Wrangler
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Old 02-21-2012, 08:25 AM   #6
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I'd suggest a call to the state agency that runs the system to find out how high up the transponder interrogators are mounted on the poles, overpasses or whatever. If they're high, your over-cab bed module may blank them.

I'd be tempted to put it in the overhead bedroom window, if the interrogators ar high up.

Since Florida doesn't have front license plates, I guess the cameras will be looking at the back of the rig as you are driving away from them.

Washington State has been having a lot of problems with its transponder systems. They have several and they aren't compatible with each other, so some folks have three different transponders for their regular route.

I don't drive any of the regulated routes on a frequent basis, but I think the interrogators on the WA systems are mounted on poles about 20' high and they're angled to look downwards as the vehicles are about 150 feet away.
Frank Damp -Anacortes, WA,(DW- Eileen)
ex-pat Brits (1968) and now ex-RVers, as of 08 Dec 14.
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Old 02-21-2012, 08:27 PM   #7
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thanks for the info everyone,

I went ahead and put it about 3 inches from my dash in the middle of the windshield. I will find out tomorrow if this placement works as I will be heading out tomorrow night. The reason why I'm thinking of this placement is because if I put it just 2-3 inches below the top of the windshield it might not register because of the cab-over. THOUGH I did not think of putting it in the overhead bedroom window. I'll let you know which will work!

Thanks again
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Old 02-22-2012, 08:01 AM   #8
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I got the Sunpass "Mini". It is essentially free, that is, you pay $5 for it in the store and when you register, you start off with $5 in your account. The instructions said to stick it to the upper-center of the windshield. I put it on the passenger side of the mirror. The driver can not see it since it is behind the mirror from the drivers view. Works great.
Ed J - Summer->Vestal, NY Winter->Melbourne, FL
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Old 02-22-2012, 08:06 AM   #9
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I just lay mine on the dash and it works fine on class A or car.
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Old 02-22-2012, 05:17 PM   #10
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We also have EZ Pass, and currently have ours mounted in the front bunk window. Works good, but for some reason, I don't like it up there. We're thinking about getting the one that bolts to the front license plate. The EZ Pass office says they prefer the license plate mount for RVs.
'87 Coachmen Leprachuan 27' on Ford E 350 w/ 460 cid, Hedman Headers, dual flowmaster exhaust
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Old 02-23-2012, 08:19 AM   #11
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Mount both EZ Pass and Sunpass Mini next to each other on bunk window. No problems.
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Old 03-01-2012, 11:20 PM   #12
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Well I wanted to update everyone about the Sunpass Transponder. I mounted it as I said before 2-3 inches from the Dash in the middle of the windshield. Because this unit doesn't beep, I didn't really trust it. I had thought at first that it didn't work on the first toll (which was when I got the ticket to enter the turnpike). Then in Leesburg, FL I did see a green Thank you when I went through and I felt better about it working.
All said and done almost all tolls worked except for one of them. BUT due to the fact that they take an image of the license plate, I checked out my usage on sunpass.com and realized that they automatically deducted the toll through what they call an image toll of the tag. Since I've registered the tag on the RV they took the toll 5 days later! I say it works fine where I put it!!

Thank you everyone for the responses.
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Old 03-02-2012, 09:37 PM   #13
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98 coachmen have mine right at bottom of glass between wipers, just lay'n there lose

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