44.9 inches listed in the product overview.
About 15 inches from floor/ground to tire plate or bottom of the tire.
I would have to say China judging by the instruction that comes with it and the quality of the product. Nothing you get says made in U.S.A. or China.
About 18 to 21 inches
The instruction one page sheet says 2000kg. The product is made with 1 inch by 1/8th inch angle iron and the tire lift plate is 1/8th inch steel plate. Support safety lift columns are 1 inch square tube with 1/16th inch thick walls. Now how much do you think something that flimsy would support. I have two of them and I even doubt that it would support 5 tons. Rember if you intend to crawl under your vehicle your life may depend on these ramps
Yes, any vehicle or trailer not weighing more than 5-tons. Trucks and SUVs generally have higher ground clearance by design, so the built-in hydraulic jacks might not be needed for those vehicles; the ramps themselves combined with the existing ground clearance of high-profile vehicles should provide enough undercarriage clearance. Low-profile vehicles are closer to the ground by design, so driving them up the ramp might not provide sufficient clearance to perform inspection/maintenance of the undercarriage, hence the built-in hydraulic jacks can provide the needed additional clearance. I don't own a pair of these but am considering them as a future purchase, so I don't currently have the manual. I imagine the manual advises against using the jacks with high-profile vehicles due to load stability issues arising (pun intended) from the increased non-level height (only the front end or the back end of the vehicle are being raised depending on how the ramps are being used). The jacks are likely meant for use with just low-profile vehicles. As with everything in life: Be smart and use at your own risk.
40.8 lbs according to what is printed on the box that it is shipped in.