More and more lately, it pops into my head that I wish I could get rid of my truck. It's older and I've babied it, so it's still in great shape, but the cost of vehicle insurance has skyrocketed. Considering, I only drive it to town approximately once per week (for supplies and to visit the post office), it just seems like a waste of money.
However, I am so rural that a vehicle is a necessity, even just for emergency medical purposes. Those services would never make it here timely, or even at all if it's been raining (takes 4WD after a good rain.) While I do have a hugely beefed up emergency medical supply kit, I'm a realist in that there may come the day when I'll have to drive myself to the ER.
And well, it's nice to have a truck to haul things. Some things are just too bulky and heavy to consider maneuvering with a bicycle or even an electric bike. Delivery for nearly everything is not an option, either. i.e. I brought home two 275 gallon IBC totes. And then there is firewood, propane tanks, building supplies, etc.
Anyway, for your situation, I thought of this video I saw a few months back. I cannot find it right now, but the gist is that the guy was operating an electric bike and was 'towing' behind him this modified dolly setup. You know, those dollies they use to haul furniture and heavy books around? Well, instead of it being straight up and down, he modified it so it was slanted more (so could hold more items without them falling) and he used what looked to me to be wheel chair wheels. And he attached it to his electric bike by this bar he welded to the dolly. It seemed like a cheap, simple way to create a trailer to use for moving more things around using only an electric bike.
If you type in, 'electric bike trailer' into YouTube, you'll see a variety of trailers people have either built or bought for this purpose. But nothing compares to the one I mentioned above, in terms of simplicity and cost-effectiveness, IMO. Could probably even fashion some sort of umbrella setup to help protect you from the inclement weather.
Outside of this, and all that the others have mentioned, the only other thing I can think of is maybe once you acquire your land, try to work out some sort of deal with a neighbor. Is there a skill you have that you could help him/her with, in exchange for rides for supplies, or even having the neighbor flat out get and deliver things for you? I know that if you were my neighbor and you'd be willing to help with projects around here, I'd definitely do that for you, especially since I'm already going to town anyway. And if you were a neighbor, it's not like I'd be going out of my way much.