^(EDITS 11/18/2019:)

• ^(Added info on expanding foam to disable vehicles.)
  
• ^(HKPF riot Unimog (likely water cannons) manufactured by) ^(Centigon France.)
  
• It appears the water cannons do NOT use run-flats. Therefore, puncturing tires is the best way to disable them.
  
  _____________________________________
  
  

  Tow straps and chains as barriers?
  

  
  If protesters wanted to be really effective against Unimogs and other vehicles, I believe the best thing to do would be to use a tow strap across the road, attached to two solid objects. A 3"x30" strap would be the minimum choice. You could easily fit one in a backpack and deploy it quickly. Even with a steel plate bumper, the Unimog would suffer damage trying to break through it:
  
  This is a good example of what I mean. The only difference here is that the strap is sandwiched in a metal tube, but the strap itself is the part that absorbs the kinetic energy of the vehicle. By attaching it to other heavy objects on the side of the road, anything that attempts to ram is effectively stopped or destroyed.
  
  If you REALLY, absolutely, positively wanted to stop people from dismantling your barrier by hand; use two lengths of minimum 3/8" Grade 70 chain with slip hooks and tension them together with a come-along before linking the ends with a bow shackle or the slip hooks, if that works. Not as strong as a tow strap, but you would absolutely be maimed, likely killed, by cutting one under tension and standing nearby. The only way to remove it would be to untension it with the come-along, which would take a long time.
  
  

  Tow straps or chains to entrap or destroy police vehicles?
  

  
  Consider hooking up a 2"x20' tow strap while these vehicles were stopped or moving slowly past a roadside tree. These straps usually have an ultimate break strength of 17,000 lbs, so there's no way they're getting away if caught at a standstill and the strap is attached to something springy, like a tree.
  
  Some of these riot vehicles still have their stock recovery points, but attaching a strap to the cage armor they use on their water cannon/Unimog trucks would do a helluva' lot of damage if they were to drive away whilst the strap was tired to something solid - a tree, building, barrier - on the other end.
  
  It's like how they stop the AT-AT's in Star Wars... but with offroad recovery straps!
  
  The HK Police's UNIMOGhas some weak points as well. A tow strap could be attached to anything circled in yellow, and a tree, or some other heavy object on the side of the road. If the snorkel circled in red could somehow be blocked, the engine would receive no oxygen and stall. Due to the purpose of a snorkel (water fording) it makes sense that this is the only air intake for the engine.
  
  

  Expanding foam to disable vehicles?
  

  
  HK Police's tactical vehicle - the Unimog that was moltov'ed the other day - uses a snorkel as its air intake, instead of a convential intake near the grille. This snorkel, however, is a weak spot. If something blocks the intake, the engine starves of oxygen and is disabled until the blockage is removed.
  
  

• UNIMOG snorkel closeup
  
• HK Police's UNIMOG - snorkel circled in red
  
  There are two types of foam:
  
  
• AB liquid foam, which can be exposed to air until mixed together - it begins to expand after 30 seconds.
  
• Canister spray foam, which comes in a can similar to spray paint. It begins to set once exiting the can.
  
  Expanding construction foam would near-instantly block the snorkel, and the engine would starve of oxygen quickly. Effectiveness depends on if the air filter is on top of the snorkel or inside somewhere in an air box. Most designs include the filter at the top of the snorkel, and it may be possible to be forcibly pulled off. Ideally, you need to get the foam past the filter.
  
  Expanding foam could applied with the following methods:
  
  
• Puncture a canister of spray foam then immediately throw the canister into the vehicle's air intake.
  
• Use two part AB foam, pour both into a balloon, tie the balloon, shake it, and throw into a snorkel, air intake on a vehicle, at anything else you want to hit.
  
  

  Fishing nets with barbs to entrap or destroy vehicles?
  

  
  Protestors Might also consider using spiked nets:
  
  https://www.dailymail.co.uk/news/article-4870602/Police-reveal-spiked-net-stop-vehicle-terror-attacks.html
  
  https://www.youtube.com/watch?v=R77cNfruMsc
  
  They wrap around the axles and immobilize the vehicle forcing the officers to abandon it. They also deflate the tires. These could likely be made from fishing nets with caltrops attached. The caltrops themselves could be made from steel wire, similar to how barbed wire barbs are made.
  
  Thank you to /u/stressed_member for the suggestion.
  
  

  Police vehicle facts, photos, and schematics:
  

  
  

• The tactical vehicle (?) is a Mercedes UNIMOG 437.
  
• EDIT: The water cannon trucks are Mercedes Axor 1824.
  
• The UNIMOG is manufactured by Centigon France. See: (News article)
  
• The water cannon likely manufactured by Centigon too; rarely do governments usually stick to one contract/one equip. provider. Centigon France does indeed do "bespoke" products.
  
• The HK Police's UNIMOG uses Michelin XZL/X-Force tires. These are tough but NOT run flat. A large enough puncture and they would deflate beyond a point where the central tire inflation system could NOT maintain pressure.
  
• Not sure what tires the water cannon vehicles use, but likely similar tires.
  
• However, these tires may include run-flat addons.
  
  
• EDIT:It appears the water cannons do NOT use run-flats.
  
• Run-flats are usually rubber or plastic. They can be melted.
  
• Water cannon schematics
  
• Water cannon right/front
  
• Water cannon left/rear/partial interior
  
• Water cannon front closeup
  
• Water cannon chassis/drivetrain (best I could fine was a scale model of the MB Actros).
  
• UNIMOG left/front
  
• UNIMOG snorkel closeup
  
• UNIMOG drivetrain
  
  

  DIY tools to cut or destroy any material, including steel and concrete:
  

  
  These may be useful for manufacturing Czech Hedgehogs or other barriers from heavy gauge steel (i.e. 1/4" or more). It could also be used to cut into structures of vehicles. Please use responsibly, as these tools can be VERY, VERY destructive!
  
  

• DIY backpack-portable thermal lance.
  
• DIY thermite with easy-to-light fuse.
  
  • Thermite may be your only chance at stopping large, armoured vehicles. It will burn through absolutely anything.
    
  • It can be made more potent by adding metals that are more reactive than aluminum.
    
  • Thermite can be placed in an aluminum beer can and tossed. It can also be placed in a ceramic flower pot to help channel the molten iron. The aluminum can may be tossed, though it is less effective overall. The ceramic pot would shatter if tossed, but it is extremely effective if used on a stationary object and allowed to burn something below. It is most effective if the fuse goes all the way to the bottom and you are able to begin the reaction at the bottom of the thermite pile, rather than the top.
    
    ^(Thank you to everyone who gilded my post.)

• Get a tow rope.
  
• Connect one end to the tow hook on the Camry
  
• Connect other end to tow hook on another vehicle
  
• Drag it out of driveway
  
• Disconnect, wash hands, smile.

There are two places to hook up near the hitch of the Ridgeline and then the other end was wrapped around the other truck’s frame. I used this strap from amazon; Presa 21079 Heavy Duty 10000 lb.... https://www.amazon.com/dp/B011ARI3FK?ref=ppx_pop_mob_ap_share

I saw them struggling and the front wheels spinning so I’d assume it’s a 4x4 if the front wheels had power?

So this would be a good thing to cary aroung ?? I currently only have a old rope with hooks (thing must be 30 years old hehe)

http://www.amazon.ca/Capri-Tools-20-ft-Heavy-Strap/dp/B011ARI3FK/ref=sr_1_1?ie=UTF8&qid=1453673042&sr=8-1&keywords=tow+strap