The TH-9000D is the same VHF rig I have in my car. MURS is great. The TH-9000D also offers voice inversion scrambling. Program the MURS frequencies in with scrambling and then without scrambling.
Also, since you're planning on using MURS, I would program the five MURS frequencies in with a CTCSS (PL) or DCS (DPL) tone for transmit and receive. There are data link or telemetry systems that use the MURS frequencies and will cause an annoying "crunch" sound every time they send a data burst...and that can get very annoying. Using CTCSS or DCS will eliminate the interference from those telemetry systems.
Remember to program the MURS channels (and everything else - except the NOAA weather channels) in 12K bandwidth mode. Program the NOAA channels in 20K bandwidth mode or 25K bandwidth mode.
I recommend using CTCSS that isn't the default 67.0 Hz, 74.4 Hz, 77.0 Hz, 88.5 Hz, 100.0 Hz or 136.5 Hz tones. Don't use DCS 023 either as that appear to be default ones. Wal-Mart tends to use 67.0 Hz, 74.4 Hz, 77.0 Hz and 136.5 Hz CTCSS tones. Other CTCSS and DCS tones/codes to avoid using include 85.4 Hz, 79.7 Hz, DCS 074, DCS 174, DCS 743 and DCS 754.
Your best bet is to use a CTCSS tone like 110.9 Hz, 114.8 Hz, 156.7 Hz, 162.2 Hz, 167.9 Hz, 192.8 Hz, 203.5 Hz, 210.7 Hz, 225.7 Hz, etc. or a random DCS code. A channel plan could look like this:
CH 01 - 151.8200 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: 156.7 Hz] - Scrambler Mode 2
CH 02 - 151.8800 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: 156.7 Hz] - Scrambler Mode 4
CH 03 - 151.9400 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: 156.7 Hz] - Scrambler Mode 6
CH 04 - 154.5700 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: 156.7 Hz] - Scrambler Mode 3
CH 05 - 154.6000 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: 156.7 Hz] - Scrambler Mode 5
CH 06 - 151.8200 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: 156.7 Hz] - Scrambler OFF
CH 07 - 151.8800 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: 156.7 Hz] - Scrambler OFF
CH 08 - 151.9400 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: 156.7 Hz] - Scrambler OFF
CH 09 - 154.5700 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: 156.7 Hz] - Scrambler OFF
CH 10 - 154.6000 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: 156.7 Hz] - Scrambler OFF
CH 11 - 151.8200 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: OFF] - Scrambler OFF
CH 12 - 151.8800 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: OFF] - Scrambler OFF
CH 13 - 151.9400 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: OFF] - Scrambler OFF
CH 14 - 154.5700 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: OFF] - Scrambler OFF
CH 15 - 154.6000 MHz [TX CTCSS: 156.7 Hz] [RX CTCSS: OFF] - Scrambler OFF
The TH-9000D series of radios have 8 different scrambler settings (OFF, 1, 2, 3, 4, 5, 6, 7, 8 and UDF). UDF is "user-defined" and defaults to the same as OFF or unscrambled clear transmissions. Make sure both radios are set for the same scrambler mode (you can choose whichever one you want, and you could use a different setting for each channel to increase security). It is important to program the MURS channels in without scrambling turned on - especially in a SHTF situation, you will want to, at the very least, monitor other MURS radio chatter in the area.
As far as the CTCSS / DCS settings go - you can use whichever one you like, just avoid the common ones I listed in the previous paragraphs - and make sure that both radios are programmed for the same CTCSS or DCS code for a given channel. You don't have to use the same CTCSS or DCS tones/codes for each channel, you can mix it up.
CTCSS and DCS do not provide any sort of privacy. They simply reduce interference by ignoring all transmissions that do not have the same CTCSS or DCS code that your radio is set in the receive mode for.
You could then program in the other VHF business band frequencies, the public safety frequencies and the 7 NOAA Weather frequencies in as you desire. The TH-9000D has 200 channels which is more than enough for your purposes.
You may also want to consider programming the MURS channels in with the power output set to LOW and then programming them in with the power set to HIGH. Low power mode reduces your chance of interception by a distant receiver and for car-to-car communications the 10 watt low power setting usually works just fine. In my experience with the TH-9000D (I have owned and do currently own several of them) is that the low power setting is generally 8-12 watts, medium power is around 25-27 watts and high power is 65-70 watts. These minor variations make very little real-world difference. However, if your wife is only a mile or two away from you, you don't need to be transmitting 70 watts to talk to her. Use high power when maximum range is required.
Make sure you set the radio to 12K bandwidth mode (narrowband FM) when you program the TH-9000 radios. They default out of the box to 20K or 25K which are both wideband FM settings.
Program the MURS frequencies in as well as the VHF business band itinerant frequencies and the VHF public safety interoperability channels. Those are good for monitoring in an emergency as well. Everything except for the NOAA Weather Channels and 2 meter ham frequencies (do NOT use 2 meters if you don't have a ham license) should be in narrowband (12K or 12 kHz) mode. The VHF interoperability channels should be programmed in CSQ or carrier squelch receive, same with the business band frequencies. Stick with MURS for your purposes - the other channels are good for monitoring other preppers/users in your area.
VHF Business / Prepper / Militia / Patriot VHF High Band
151.6250 MHz - Militia/Patriot VHF BUSINESS RED DOT 1
151.9550 MHz - Militia/Patriot VHF BUSINESS PURPLE DOT 2
152.8850 MHz - Militia/Patriot VHF BUSINESS 3
152.9150 MHz - Militia/Patriot VHF BUSINESS 4
151.7000 MHz - Militia/Patriot VHF BUSINESS 5
151.7600 MHz - Militia/Patriot VHF BUSINESS 6
151.9250 MHz - Militia/Patriot VHF BUSINESS 7
151.8350 MHz - Militia/Patriot VHF BUSINESS 8
151.8050 MHz - Militia/Patriot VHF BUSINESS 9
151.5125 MHz - Militia/Patriot VHF BUSINESS 10
151.6550 MHz - Militia/Patriot VHF BUSINESS 11
151.6850 MHz - Militia/Patriot VHF BUSINESS 12
151.7150 MHz - Militia/Patriot VHF BUSINESS 13
151.7450 MHz - Militia/Patriot VHF BUSINESS 14
151.7750 MHz - Militia/Patriot VHF BUSINESS 15
151.8650 MHz - Militia/Patriot VHF BUSINESS 16
151.8950 MHz - Militia/Patriot VHF BUSINESS 17
151.9250 MHz - Militia/Patriot VHF BUSINESS 18
151.5050 MHz - Militia/Patriot VHF BUSINESS 19
154.4900 MHz - Militia/Patriot VHF BUSINESS 20
154.5150 MHz - Militia/Patriot VHF BUSINESS 21
154.5275 MHz - Militia/Patriot VHF BUSINESS 22
154.5400 MHz - Militia/Patriot VHF BUSINESS 23
153.0050 MHz - Militia/Patriot VHF BUSINESS 24
154.6550 MHz - Militia/Patriot VHF BUSINESS 25
158.4000 MHz - Militia/Patriot VHF BUSINESS 26
158.4075 MHz - Militia/Patriot VHF BUSINESS 27
The MURS frequencies are also included in the channel plan above, I omitted them since you're going to be programming them in anyway. MURS 3 is generally considered to be the "primary" or "calling" frequency.
Since you're in New York, you should also program in these New York state specific frequencies (again, for monitoring/listening purposes)
154.6950 MHz - New York State Police Statewide Emergency/Broadcasts Channel
154.6650 MHz - New York State Police Car-to-Car
155.3700 MHz - New York Statewide Public Safety interop (included below with interop frequencies)
https://www.radioreference.com/apps/db/?aid=615 - for the NYSP frequencies - I would include the ones local to you as well as the ones surrounding you.
VHF Public Safety Interoperability
155.7525 MHz - VCALL10 - Public Safety VHF Calling
151.1375 MHz - VTAC11/VTAC36 - Public Safety VHF Operations
154.4525 MHz - VTAC12/VTAC37 - Public Safety VHF Operations
158.7375 MHz - VTAC13/VTAC38 - Public Safety VHF Operations
159.4725 MHz - VTAC14/VTAC39 - Public Safety VHF Operations
155.3700 MHz - Law Enforcement Intersystem - often called "INTERCITY"
155.4750 MHz - VLAW31 - Nationwide VHF Law Enforcement Interoperability
155.3400 MHz - VMED28 a.k.a. "HEAR" "HEAR340" - Hospital/EMS/Medical Interop
154.2800 MHz - VFIRE21 - Fire Interop
154.2650 MHz - VFIRE22 - Fire Interop
154.2950 MHz - VFIRE23 - Fire Interop