You never know unless you try. 270kg sled tow, sometimes you are just not strong enough yet, other times your damn shoes just slide on the concrete. Time to buy mountain climbing shoes, I've been told they steal great for this.
How bad do you want it? Are you willing to train every week, month and year. Stick to meal plans. Think of solutions instead of excuses. Then if that's the case, you can achieve anything you put your mind to.
There is no best program. Everyone will respond differently to training stimulus. There are smart programs designed for you and your goals and then there are crap programs. I know what program I would do.
Dosen't matter how strong your body is if your mind is weak than you will always fail. Train your mind as well as your body. Never be afraid to ask for help if you find yourself in a negative place mentally, sometimes we all need help.
So you are a beginner or looking to get back onto the gym. You are looking for help with a trainer what do you look for. If they are to busy trying to sell you instead of asking you what you want and listening to what you say. Don't use them. If you haven't seen results in 4 weeks, that could be anything from increasing lean muscle mass, loss of body fat% or increase in weights lifted than walk away you are wasting your money.