Don't have a 3/4" impact. I have tried soaking with PB Blaster for a week and then putting a 6' pipe wrench (Yes, that's 72", not a typo) on it with a cheater bar to boot. No joy. I'm resolved to the fact that it would likely take a blue wrench or a grinder to remove. Up to this point, it hasn't frustrated me enough to go that route.
I don't have a 2" receiver. I have a 2-1/2" Class 12 receiver welded to the frame. Not in the way though so I'll count myself lucky.
Took me 4-1/2 hours to get the new tank in (in addition to the 3 hours it took me to pull the old tank out the night before... in the rain...). I concur that cursing should be applied liberally and frequently during the process.
My final process was to attach the outer vent hose to the tank first. Then start the filler tube inside it and prop that end (driver side) up against the frame. Doing so caused the filler tube to act as a guide later in the process, and supported that side of the tank throughout the process. Next I started sorting through various pieces of wood blocks and firewood to find something that would hold the other end of the tank up just enough that I could barely reach the supply and return lines. This is where the cursing needs to be applied extra thick. After about an hour of fidgeting, cursing, yanking, cursing, tugging, cursing, pulling, cursing, bending, cursing, reaching, and down right getting ticked off, I finally was able to get those lines reconnected. If Ford would have made those lines 2" longer, the process would be SO much easier. If Henry Ford wasn't rolling in his grave, I would have been willing to dig him up and flip his #$$ over myself. Once those two lines were connected (and the vent and electrical hooked back up), I pushed the tank up in there as far as I could and supported it with a piece of firewood. It was still too far over to the passenger side to get up in there, so I went over to the drivers side and got the outer vent tube started back on at the body. Once that was on there, it was just a matter of wiggling, cussing, and pushing to get the tank back into position, during which the hose works itself back up onto the spout. Once in place, I blocked it up in there while I did the knee trick to bolt the skid plates back in place.
NOTE TO SELF! When using and impact to install l the skid plates, DO NOT let the meat of the palm of your hand get sandwiched between the skid plate and the frame! Doing so will require an extremely potent dose of cursing to get the impact reversed and get your hand back out.