I own the Belltec TM48 and am very pleased with it, It is a 3pt hydraulic down pressure implement and cost around $4,000 just for the auger and the bits run around $300 for a puff drill (tpost size bit) to $1,600 for a 12" they have other sizes but these two I own. I can drill thru solid limestone down to about 6 foot with the 12" RAD bit in less then 15 minutes and many will go down in 5 or less. It is sweet and if your drilling in rock is the only way to go. They do make front mount augers for skidsteers but are not advisable for a tractor loader arms. I have all four tires solid filled and the tractor weighs well over 10,000 closer to 12,000 pounds, when drilling thru rock the entire hookup tractor and auger go thru some serious girations that would tweak your loader frames matter of fact with enough speed the tractor is rocking back and forth enough to almost get air under the tires. It would truly be a bad fit on the front of a tractor just to much stress. It also requires two sets of remotes one set for the hydraulic top link and the other set for the hydraulic down pressure the auger runs off the pto. This is where a skidsteer hydraulic auger really shines because with a hydraulicly driven gear box you have reverse with the pto you do not at least on most tractors. I have proven that you can get a 12" auger stuck in rock at 6' deep and also that it takes 4 men 4 hours a big adjustable wrench and an 8' cheater bar to back the auger out of a hole once its stuck, the lesson is never never let your speed drop until you are on the way back out of the hole OOPS. I'll include a picture of mine mounted sorry its not a better picture it was taken from the front for AG tax purposes showing the grapple to gather brush on the ranch.
Steve