I should have mentioned the battery issue in my first reply,
The battery in the CRV Is very much undersized. The standard OEM Group 51 battery is in the order of 400 CCA which is not much bigger than a good Lawn Tractor battery. On the newer models particularly with Nav etc, the battery will go dead in 2-3 hours of towing. Honda says to pull a fuse for towing but when you do that (which by the way you need to be double jointed to do) the Aux Power plugs go dead.
So, the solution is to replace the battery with a Group 24, 850-900 CCA battery which is standard in the Oddesy. The switch is very simple. Just go to your Honda dealer and purchase the two piece battery tray which will cost under $20. See attached photo for the P/N's.
Then buy a group 24 battery and install it in the same way as the OEM. NAPA had an 850 CCA for around $140 if I recall.
Now, you might also want to consider a charge line from the MH to the CRV battery. This too is pretty simple and is very common on most toad set ups. It does exactly what the term implies, keeps the toad battery charged from the MH battery while under tow.
A wire is run from the Live side of the master switch in the MH engine compartment, thru a 20A inline fuse, to the Aux Pin on your 7Pin connector. I believe it is the 1 O'clock position looking at the open side of the socket.
Now, from the corresponding pin on the toad side, run a wire thru another 20A fuse and connect to the Positive side of the battery on the CRV.
You can, if you wish, add a diode in this line to direct current from the MH to the toad but IMHO, it's not necessary. The voltage from the MH to the toad will always be higher when the toad is not charging and therefore the current flow will be to the toad anyway. I don't have a diode and it works fine. The important thing is the fuses. You can use a resetable circuit breaker instead of a fuse which will reset on its own. Your choice.
By making these simple changes, you will now be able to run ALL Day long and arrive at your destination without having to boost a dead battery on your toad AND, not have to worry about pulling fuses etc. I have run for two days without unhooking the toad and just starting the car for a few minutes in the AM to lube the transmission.
The CRV is a great car and a really great toad. It just has a battery problem.
P/S, one other thing about towing, if you look at your manual, it says you should change the transmission fluid every 18000 miles. I do mine every year.