The US Army and its support echelons in the form and in the strength that it was deployed historically, did not have the strength or the depth to tackle the German army, if the Germans were unfettered by their commitments in the East
According to Shelby Stanton (and I can quote him later if need be) the US Army had the capacity to provide about 20000 fillers per week (I think it was per week…I will check the time frame tonite). However, in any three month period from June 1944, the combat divisions committed to the battle suffered over 100% casualties, including non-lethal casualties over that randomly selected three month period. Roughly 50 Divisions were committed to front line operations June 1944 to May 1945 (sometimes more, sometimes less, for example by December 1944, there were 63 US divisions at the front)> With a 100% per quarter casualty rate (a not especially high rate of loss) and 50 divs assumed to be committed to the front, the Americans needed about 775000 fillers per quarter. They were receiving 240000. Some of the shortfall could be filled by wounded returns. Roughly 40% of the wounded could return within 5 months, another 30% would return to some level of service within a year. From memory Stanton assessed the average turn around time for a wounded soldier, from time of injury to return to active service, as about 7 months. At that rate, there would be a return rate of about 70000 men from the sick list each month, or 210000 per quarter. From returns from wounded plus new enlistments that complete basic, the US was receiving about 450000 men, so the net shortfall per quarter for the US Army, against a small part of the German Army, was roughly 325000 men per quarter. They filled these deficits by desperate expediants…..roughly half (from memory) of the nondivisional forces like TD units and AA formations were scrapped and the personnel press ganged into the Infantry and/or armour. About ¼ of the divisions fielded were designated (replacement Divs (not the right name, but that's what they were) and no longer capable of mobile offensive operations. Their sole role in life became defence and providing fillers for the 30 or so assault formations..
In the chaos of late 1944 and 1945, these expedients were good enough for the US Army to muddle through. The Wehrmacht was so stretched, so short of equipment and replacements itself, and so in a state of perpetual crisis, that such shortcomings that the US Army did possess were dwarfed by those being suffered by the Germans. However, in this scenario, the Germans would have none of those difficulties and moreover would have most of the logistic issues that plagued them solved. They would be present in far greater strength and in a far better sate of training. A far higher percentage of US casualties would be unrecoverable, because far more American prisoners would be taken in this hypothetical campaign.
The US Army was never short of equipment, in fact it was probably oversupplied with equipment. Equipment was never the limiting factor for the US Army, it was always the shortages of trained manpower that prevented or limited its full potential. And that was not a problem easily solved except with more time. The problems with assuming the US could afford more time have been discussed already. Some may choose to accept that, some not.