Electronics in general, and back up camera systems, continue to improve at a rate faster than their prices increase. I'm sure tadibros is selling good stuff. I purchased my system from
Backup Camera System | Rear View Backup Camera | RearViewSafety.com
Reasons:
The RVS system uses one wire to each camera and that single 5 conductor wire carries power, video, and audio*. This system also uses a separate "multiplex" box that everything is connected to - one wire to the monitor, one wire to each camera, and 12 volt power need only be provided to the small multiplex box. Having only one small wire to each item makes for a cleaner install. There is a possible downside - the in-line waterproof connector RVS uses is on the one hand convenient, but it does require a 9/16" hole for the connector - suitable grommets are provided, but that helps little when trying to run that connector through tight places. The solution is to cut the cable and then you only need drill a hole for the 3/16" diameter wire. Splicing the wire later, or adding an in-line waterproof quick connect plug (as I did to allow removal of my front loader with no hassle) is easy.
Cost for the RVS system looks to be lower than tadibros. I bought my "single camera system" for less than $200 from Costco, then purchased a second camera on Amazon for $74. Monitor is 7". Tadibros does offer larger monitors, but for my installation the 7" monitor is just right and with excellent video quality, doesn't wash out in the sun.
Not saying RVS is the best or only good choice . . . there are a number of good choices. I chose RVS as it was getting good reviews on the RV list I'm on, and their customer service is excellent.
*The cable connector plug used by RVS is a waterproof mini-DIN style 5-pin connector that may be proprietary. I searched on line and could not find this connector as a separate component. A quick call to RVS and they sent me an addition cable w/connectors at no charge, but what I'd asked for was extra bare connectors! Oh well, I ended up using a different waterproof in-line connector for disconnecting the front loader, easy enough. So while RVS's single connector does make for a clean installation, there may be other considerations depending on your ability to solder wires etc.
Tadibros appears to charge extra for the wires to run 12 volt power or audio to their cam from a central point. On a tractor install, having the 12 volt power from one source may make more sense, as does at least in my case, only having one wire to the monitor as that wire is exposed for a few inches in the cab. Having all items wired back to the monitor (as opposed to a multiplex box) would not make as nice an install IMO.
"Wireless" vs. wired: In a wireless system, you don't have to run wire back to the monitor for each cam's video - but you still do have to run 12 volt power to the camera in any case (this power may be available nearby where the camera is to be installed anyway - so that may tilt the choice toward wireless for ease of installing wire. However, wireless will be subject to the vagaries of radio transmission, possible interference etc. while a wired system, though maybe more work to install, precludes that possibility.
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