(mtm737 - you may have unintentionally hijacked this thread - you may want to start a separate post with the name of your Toad in the subject...you'll likely get more responses that way)
RTinVA - Call me biased, but I've towed (amongst many other brands and models) 3 different Ram Laramie's behind my coaches, all with the Blue Ox Aventa which is now rated at 10K lbs - plenty for even my last 2500 long bed diesel crew cab 4x4 I towed. So I would suggest that bar - but perhaps more importantly, I'd suggest the truck you have as a great Toad for a lot of reasons - one being the ease at putting it in and out of towing mode (I'm struggling with a new GM now - the 2015 GM's don't quite have the ease of towing that Rams do).
I always use diodes and tap right into the tail and brake lights right at the assy in the rear - much easier than trying to get past all kinds of things that can hijack the basic concept of applying voltage to the light you want to light when you want.
And I prefer the stand-alone brake boxes - I'm using a Blue Ox Patriot and have been through a few Toads in the last few years. Prior to that I used a Roadmaster unit CW sold, but the latest version required too much hardwiring into the toad, and I tow so many different vehicles that I didn't want to be doing that. Portable has to mean portable to me.
Don't be mislead into thinking it's safe to tow a toad without supplemental braking of some sort - sure, lots of people do it, but ask those who have had to make a panic stop locking them all up whether they would have hit whatever jumped out in front of them if they didn't have braking in the toad. I know I would have. An extra X-thousand pounds of rolling force pushing against your braking efforts will push you a whole lot further before you stop...there's of studies out there to prove that, that you can read if you want.
I have been able to get the Aventa's for less than $700, while the baseplates although far less costly require a lot of labor to install, and since I'm a safety freak I have the baseplates welded onto the truck in addition to being bolted so I don't have to worry too much about them coming loose ($1200 total to install and weld). The wiring costs me about an extra $150 to have done, and the Patriot costs about $900.
I have saved a buck (but skinned too many knuckles) by installing baseplates myself now and then, and then having a local shop weld them to the frame - the heavy duty Rams (2500 and 3500) had snowplow mounting frames as part of the front framework which made a good location to attach the baseplates - not sure if the 1500's have that too, though.
Get that thing set up and have fun towing it! Nothing like having a 4x4 pickup toad to use in so many ways when traveling this great country of ours!