For the cost of the upgrades, you can purchase a tandem axle trailer with brakes to pull that camper on, and have a ton of storage for coolers, generators, bikes... whatever. It'll be safe and efficient until you can afford the truck you need.
When you get the new tuck, pop the camper in the bed and sell the trailer. You'll probably recoup a bunch of your initial investment back, and not have killed your F-150 in the process.
We did substantial upgrades to the suspension of my F-350 to get it to handle the weight of my TC, and I just upgraded the brakes again- plus, I had to replace several suspension components... This after doing ball-joints at 50,000 miles. Don't let anyone kid you... These heavy TC's are hard on the trucks and their suspensions.
You can be marginally safe if you spend a lot of money on your current truck- but I have been in a couple of white-knuckle panic stops during my TC ownership time-frame, and I can tell you this... it is not fun. We always think nothing will happen to us, but it's the other knuckleheads, deer, road-hazards, and sudden mechanical failures you have to plan for. These things are a handful, even when set up perfectly.
I know you don't want to hear this, but think long and hard before you put your family in harm's way over a truck that could be gone tomorrow. There is always a way out of a vehicle. If you've got money to upgrade, you've got money to trade.
JMHO. Be safe,
2G