[Postimages link went sideways during edit: Re-linked 3-posts below. Sorry]
A bonus of the Pioneer 3500avh I just installed: back-up cam input. Along with installing the cam as a hitchguide, it would be cool to rig your trailer with L/R cam-feeds to monitor tires/bearings (though that would require a split-screen processor).
Towards short-haul heavy-towing & tractor-duty, I also installed a 7-spade connector w/brake controller & power supply:

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If you prefer the ability to view your cam/vid inputs with vehicle in motion, compatible head units require that you ground the feeds intended for the p-brake and "Park" switches.

Both Head Unit & Cam purchased during Nov. Consumer Sharknado:
@ Newegg: Pioneer AVH-3500NEX 7" 1-DIN DVD Receiver w/ Motorized Display $400. During install I barely bumped it's frail fn single rotary-knob, busted-off:$37! Maybe Crutchfield would've replaced it, but not newegg.

Camera@Bezos: RAAYOO L002. Waterproof? Fine question! Given intended for ext. mount, I'd assumed yes, but at $20 I may be in for some bad news next boat launch.

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'15: bought '05 w/138k.
'16: HG/Rockers/ARPs/Thermo/H20pump/TbeltKit/ Seals/ Mounts/Kennedy fuel pump.
'17: bought manual Gas donor for its' ARB F/R Airlockers, OME 2.5" lift (gas-rated), JBA UCAs, ARB bumper.
'19: Trans w/Suncoast/Transgo/HDdiscs, new OME CRD-rated lift, electric tri-fan setup, BlackMagics/Centric Premiums, Airbags.

That's a great addition.

Curious, is the camera somewhat water resistant?

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2006 Limited since factory new
HDS 001 with 203° Stant
MBRP Cat Back - Stainless
Fumoto F102
ARB bumper
Bilsteins
Michelin Defender LTX 235/70/R16

Very nice upgrade. I have 7 pin and brake controller on one of mine too comes in very handy. Now just need to add a camera and screen

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05 Blu LIM, OME GDE Tbo, wk II 245/75/17, KC Lights, bull bar, 195K H TC
05 Blu Lim, Dayton, GDE HT, 255/75/18 , 210K , H TC
06 Bla Lim, GDE Eco, Destination AT 245/75/17, 151K, H TC
06 D Khaki Lim 126K wkII Eur TC
05 D khaki Lim 145k refurbishing
All CRDS: Fumoto, Lift , Fan Shroud mod, fuel head Gen II, SAMCOS,self TB, 2 Mic filt, Hayden

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'15: bought '05 w/138k.
'16: HG/Rockers/ARPs/Thermo/H20pump/TbeltKit/ Seals/ Mounts/Kennedy fuel pump.
'17: bought manual Gas donor for its' ARB F/R Airlockers, OME 2.5" lift (gas-rated), JBA UCAs, ARB bumper.
'19: Trans w/Suncoast/Transgo/HDdiscs, new OME CRD-rated lift, electric tri-fan setup, BlackMagics/Centric Premiums, Airbags.

I wonder if an old mobile device like a iPad could be used instead of the Pioneer display. Lots of old mobile devices available for CHEAP in online classified ads and marketplaces.

If it serves the function, cheap is good.

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'15: bought '05 w/138k.
'16: HG/Rockers/ARPs/Thermo/H20pump/TbeltKit/ Seals/ Mounts/Kennedy fuel pump.
'17: bought manual Gas donor for its' ARB F/R Airlockers, OME 2.5" lift (gas-rated), JBA UCAs, ARB bumper.
'19: Trans w/Suncoast/Transgo/HDdiscs, new OME CRD-rated lift, electric tri-fan setup, BlackMagics/Centric Premiums, Airbags.

Cheap is good, but only if it is reliable and it functions properly. Ask me how I know.