Please note that the TST507 is actually the newer model of the TST510. Also, on the repeater, I went a little different path. For about $10, I bought a 120V-AC to 12V-DC converter, plugged it in behind the bedroom TV and hooked the repeater to it in that same cabinet. I know some folks will tell you the repeater is not needed until you hit 53', but you gave to factor in the mass of the coach between the receiver and the toad, etc. in my case, with a roughly 40' coach, a couple of the toad sensors were dropping off, so I added the repeater.
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2015 Legacy SR340 360RB with 2014 Wrangler Unlimited Toad
Gigi, Poppy and Sadie the Jack Russell (all 14 lbs of her)
2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad
Gigi, Poppy and Sadie Lady...On the road, but not full time!