eTrailer has some Youtube videos on Blue Ox baseplate installs on Frontiers. I didn't see one on a 2005, but there's one on a 2008. I wouldn't think it's too much different. The video should give you some idea of what's involved.
https://www.google.com/search?q=fron...iw=1164&bih=55
I installed a Blue Ox baseplate on my 2011 Honda Odyssey and, although it wasn't complicated, it took me a lot longer than the quoted times I'd read, so be prepared.
It's a good idea to check the ground to hitch height on your motorhome and compare it to the ground to baseplate connection point for the various brands of tow bars. Some may be closer than others, which can affect whether or not you need a drop or rise adapter (or the size you need). Your tow bar will need to be within +/- 2" from level when hooked up. The smaller the starting variance the better.
Also, with the Ready Brute, routing the cables to and through the firewall to your brake pedal can be a challenge. Ready Brake's website says 2 hours, which may be true if you have a lift, etc. but it wasn't my experience. You'll need a pair of ramps or jack stands so you can raise your front end.
Don't install the baseplate until you have the Ready Brute since you'll want to install both at the same time while your front end is opened up.