Okay, you are of average height and your leg length is a little above average. That is good, because taller tires handle weight better. 26" and above tires then, 2.1" cross section minimum. Those are good for about 200 lb apiece at 55 psi max inflation. Some bikes come with 2.4" tires. Fat tire (3.0" up) bikes are out for 165 kg weight, they have a pressure limit of about 40 psi.
There are two ways of distributing a person's weight evenly between the two tires. Road bike position, hips up, flat back, neck bent back 90 degrees from the back. Not popular with the ebike crowd, and those 120 psi 25-30 mm tires ride like steel wheels. If this tempts you, look at cannondale & orbea. I don't know weight limits on those and especially eliminate from consideration carbon fiber frame models. Those road bike tires are garbage on gravel.
Other way is the stretch cargo bike frame that puts 70% of rider's weight on the front wheel and leaves the back for the battery, motor, and groceries. Has 2.1' tires usually. That is what I ride and that is what I recommend for you since surly got out of electric drive bikes. There is an extra 6" frame behind the seat, that distributes the weight evenly. Disadvantage, they weight 5 to 12 kg more than a mountain bike, cruiser bike, or beach bike. They won't fit on the rack on the front of a city bus in my town, and there is some question about compatibility with racks in Amtrak or Via baggage cars.
Otherwise there are 20" wheel bikes as detailed in this thread:
https://electricbikereview.com/forums/threads/bigger-guy-looking-for-an-e-bike.43653/unread
If you ever hit a pothole on a 20" wheel bike, you might regret it. I imagine they are great in downtown London Koln or Amsterdam with perfect pavement.
If you live in Alberta or BC and intend to go mountain climbing, look at the models of these brands that have mid-drive. Otherwise hills are in the realm of the cheaper geared hub motor. I cross 80 hills myself in a 30 mile commute at 8-10 mph. Carrying up to 80 lb groceries or ag supplies. I have a 1000 w geared hub motor on a yubabike bodaboda. Yuba does make a top rail frame for taller people than me.
Big wheel cargo bikes that don't have a lot of complaints in "known problems" include Konaworld.com ute, xtracycle.com , Pedego stretch (pricey but great warrenty & lots of dealers), yubabike.com bodaboda & el mondo, blix packa
https://electricbikereview.com/?s=blix+packa (24" tires, explicit 400 lb limit) reiss & mueller ( expensive, mid drive).
Other brands stretch frame bike with more compliants are m2s, magnum. Lots of fans of the tern GSD and the like, 20" tire bikes I wouldn't take for free. Lots of fans of the radwagon out there, that has a known problems list longer than your arm and requires 22" tires sold only by rad, besides. Rad is really happy to mail you a spoke or two under warrenty if you stretch the scrap they originally sold you.
I hope you're not planning to travel @ 25 mph because these bikes do not have suspensions available. Wattwagon is building a cargo bike, titanium frame with air suspension, and it will not meet your budget.
Note the shimano mid drive on some bikes can be pedaled unpowered without drag. The bosch system drags the motor with your feet if not powered at all times. I rode 50 mlles unpowered last week after a big rainstorm disabled my throttle. Not pleasant, but cheaper than a tow truck.
Happy shopping and later riding.