I've never seen a plug-in dolly. That would be cool! All the ones I've seen are battery powered and in the $1000+ range. Can you find out more about it?

AC dollies

Pile on Mr. Waldschmidt! The other garage isn't deep enough and if I have help, I can get it into the 3rd stall no problem. After 4 months of looking, merely finding one deep enough was success enough. My brother helps when he goes, but no solo trips...

I've already gotten vetoed for option #2.

Have a really nice 4-wheeler at another property, just don't have any room to store it here where the boat is. I can get it close with the truck, then line it up and winch it. But I still can't get my brain wrapped around NOT yanking the winch out of the floor or wall when the tires hit the garage bump.

Make a ramp out of a piece of 1/2" plywood

Cut you a 2x4 at an angel to create you a little ramp that you can just lay down in front of the lip. That lip should not be more than 1-2".

I'm in the metal building business, we have a ton of customers that miss their anchor locations and have to go to back with epoxy anchors. They engineer out just fine to anchor a large building so they shouldn't have any trouble with a boat. If done right they wont' ever pull out, assuming your slab is good.

There you go- Mount the winch to the floor, rig up a strap in a v to each side of your trailer and get to crankin-

Is an epoxy anchor as simple as drilling a hole, cleaning it out and squirting epoxy and the anchor in the hole? I'd need a concrete bit and the anchor right? Something a doofus could do?

Slab is good, but has a treatment over it, not bare concrete.

Masonry bit, drill, anchor, epoxy- After you set the anchor(or anchors)you will have basically a bolt sticking in the air- I know northern tool, or harbour frieght both have some cheaper winches, Or you could use a come-a-long or even a boat winch for that matter- What I don't know is if you will need to build some type of base for it- I know some of the electric winches have a mount that could probably be used- There has to be someone in Strawn Texas that could help- I might for dinner at Mary's- Ha ha

Put a hitch on the front of your truck. I will just about guarantee you putting the boat up at any angle will be a snap. I used to have to knife mine about 80 degrees and could not do it backing. With a hitch on the front I could put the boat anywhere I needed.

Wedge-it concrete anchors would be plenty strong enough bolted to the garage slab. You are only pulling the boat not lifting the boat. Buy some 1/2" diameter by 3 1/2" inch. Epoxy will work but will cost a little more, and you need to cure it. Don't use the cheap syringe type epoxy.

Get this and mount the plate to the front of your tailer then add a clamp on handle to steer it. Get some concrete anchors and mount a d-ring into the floor. If you dont want to do that drive a stake outside and run a cable thru the wall.

http://www.harborfreight.com/power-in-power-out-3000-lb-capacity-12-volt-electric-winch-96455.html

I have no idea if it would work but sounds good to me.

Maybe attach the winch to this
http://www.handandpowertoolshop.com/products/view.aspx?sku=6191113&af=1715&cse=1715

If your extra crafty mount the winch to the cart, remove the winch cable and mount a chain drive to the axle of the cart.

TexasHart... Grind that garage hump down to a taper in the areas where the tires would need the ramp into the garage. I have the same problem but I do manage even with a crew cab truck to back in a 21' boat with tandem axles, but ramping that hump will make it much easier.

Have had the same problem,but with storage in the Birminghan area..Having to pay$300,a month to keep mine in storage..Found a 12-30,storage to keep it in for $100,a month,but has a 1 ft lip..tried building a ramp,with 3/4 inch plywood,reinforced with 2 by 6's..Broke on first try..Also,messed up my surge brakes..Pain in the arse...Can't. Believe there arent any storage,here with all the boats..