There is another way to go for short leads. Just put a longer power cord on it and build a cart or put it on a two wheel dolly. I've done both. the advantage is you can build a bottle bracket for tig welding also, or just make a extention cord. They also make cords for 220V applications as well. Just my 2 cents
Yea over the years they cut costs and took away the lugs on the outside of the case. The leads are pretty small diameter as well. The diameter is too small to extend them out very long. I would just crack open the case and install a better set of leads (or have the welding supply do it for you), I am pretty sure that it would not be hard to install outside lugs on the machine either. Or as mentioned here, simply extend the power cable / run a proper extension with a cart to roll around on, BE SURE to use the right gauge of cord here (do not skimp) with a good industrial rubber sleeve. Your local welding supply will have everything you need to do this and can price your options to you. But as far as a cart for the machine goes....go get some scrap steel and build your own, good first project to do with it.