The unit we have now is our first and we bought it new last March and have had absolutely no regrets and no thoughts of upgrading to something different. We even went to an RV show in January just to look around and nothing appealed to us as something we'd like to have more than what we already have. If you want to avoid 'buyers remorse' and going through 2 or 3 trailers in a short period of time, you should go through multiple units. It took us almost 2 years to find the one that my wife and I both agreed on and when we saw it we knew it was the one for us.
Do your research on your truck, just because you have a F-150 with a V-8 doesn't mean it will work and you definitely need to check the sticker in your door jamb to find out what the payload is.
In my opinion, you'll be easily under 6,000 lbs on that unit when you're ready to camp. Ours Imagine 2800BH came from the factory with a dry weight of 6204 lbs and with a family of 4, we aren't even close to 7,000 lbs when fully loaded.