How tall of wheel chocks should I carry? Are just two adequate?
I got ours at Northern Tool. They just happen to be on sale now for 1/2 price! If you have a store near you, copy the online ad and take to store - they'll give you the online sale price. They are very heavy duty and would probably last a lifetime. 8)
I have 4 of them, tied in two pairs with pieces of nylon rope. For maximum security you would want a set under rear wheels on both sides. For a quick stop, one set under a front tire would probably suffice.
Ironton Double-Sided Pyramid Chock — Rubber | Wheel Chocks| Northern Tool +... (http://www.northerntool.com/shop/tools/product_200594355_200594355)
I use these.
Amazon.com: YM W4194 Solid Rubber Wheel Chock with Handle, 8-3/4" Length, 4"... (https://www.amazon.com/gp/product/B00ODM4I90/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1)
Ours are large rubber HF tied together with a short line. I put them in the step recess where I can easily reach them. The retraction cylinders don't come close.
Pierce