A concern I would have about a full suspension bike for a heavy rider would be that rear shock, regardless of what the manufacturer says its rated for. I recall seeing a manufactured full suspension fat bike with a claimed 'carry' load rating of 450 lbs, which didn't include the bicycle weight. But its Rockshox rear air shock was limited to an adjustment range that topped out at a rider weight of 250.
I've had challenges with rear shocks due to my weight and found the only way to truly get the bike to work was to put in a high end coil shock on a frame that could support a long stroke, and then uprate with a badass spring that could support proper sag and never bottom out. You want to know what that shock is and then see if you have upgrade alternatives in case the seller's marketing department won the argument on rider capacity.
Brakes have been pointed out as well. We've seen tragic results recently on this score that re-emphasize how important it is to put strong brakes on an ebike that travels faster than a bicycle and weighs twice as much. 4-piston hydraulics would be my choice, with 2.3mm thick downhill/ebike rotors.
None of that comes cheap.
@SCADAman29325, With a $1500 budget, most of the suggestions here are either well out of that reach, or you need to revise your thinking about what an ebike is going to cost you. The Lectric cargo bike that
@"A" linked is the only one that fits into both your budget and weight capacity, but beyond that its a short list if I take your budget seriously. Your comment that you'd use the bike to cruise campgrounds makes me think you'd want something more portable than a cargo bike. The Lectric XP 3.0 has a 330 lb 'payload capacity' and it folds. Its MSRP is $1000. Now, I would not buy this bike but they have a lot of fans and are known as a good value brand. Your budget is keeping you in this league.
Something else to note is that most bikes' often measure weight capacity as a "total system load" and that includes the weight of the bike. So a 350 lb limit takes on new meaning if thats how they are measuring capacity. You want to check with the manufacturer to see if they are talking 'payload' or the whole enchilada when quoting weight limit.