(By-the-Foot) 2 Red Stranded CU SIMpull THHN Wire

Heavy maybe 120lbs tough to load alone for myself.

Not to confuse anyone but I found this on the Southwire web site and this cable appears to be rated as THWN and THWN-2 as well: 600 Volts. Copper Conductor. Thermoplastic Insulation/Nylon Sheath, Heat, Moisture, Gasoline and Oil Resistant II. All Sizes Rated Both THHN and either THWN (sizes 14, 12, and 10 AWG) or THWN-2 (sizes 8 AWG and larger). Also Rated MTW and AWM (See Below). SIMpull® Technology for Easier Pulling. Southwire® SIMpull THHN® copper conductors are primarily used in conduit and cable trays for services, feeders and branch circuits in commercial or industrial applications as specified in the National Electrical Code. Voltage for all applications is 600 volts. SIMpull THHN® copper conductors are designed to be installed without application of a pulling lubricant. These conductors have multiple ratings. Depending upon the product application, allowable temperatures are as follows: • THHN or T90 Nylon- Dry locations not to exceed 90° C • THWN-2- Wet or dry locations not to exceed 90° C or locations not to exceed 75° C when exposed to oil • THWN- Wet locations not to exceed 75° C or dry locations not to exceed 90° C or locations not to exceed 75° C when exposed to oil https://www.mysouthwire.com/medias/sys_master/product-specifications/product-specifications/h08/h62/8854083633182.pdf note : THHN wire is allowed for use in dry and damp locations only. ... It's important to note that now many wires in the market are dual rated both THHN and THWN, which means the wire can be used in dry, damp, or wet locations. THHN wire is rated for high heat: it can be found with insulation rating as high as 90°C or 194°F.

I suppose that it could be, however due to size of the individual strands of copper in the cable it is not very flexible. Cable made specifically for welding is made from many more smaller strands.

No, 2/0 is the 'same' as 00 wire. This is #2AWG. 2/0 is much larger (in diameter) than #2 and therefore is used for much larger applications requiring much higher load (ampacity) rating. Please note that working with loads requiring either wire size is extremely dangerous (lethal). Examples per use, #2AWG could be used to wire a smaller sub-panel whereas 2/0 wire could be used in a main service panel. You can look up the ampacity rating for the wires online to determine which size wire is appropriate for the application.