Adding Camper top... suggestions to beef up!

Newbie here, 1st time posting.
Anyways... I'm planning on getting a TUNE M1 CAMPER. It weighs approximately 400lbs. I have a 2009 4 door, 6ft bed Tacoma with approximately 150,000 miles on it.
Right now it's in the shop getting the rusted-out exhaust replaced. They also said the wheel bearings and struts are shot.
What would be recommended? Should the suspension be beefed up? Anything else recommended?
I'm not auto savvy, so could you please explain in the simplest way? What parts and where to find them?
Thank you.

 

Install aftermarket shackle hangers (Archive, BAMF, etc) and a leaf pack designed to carry that extra weight (Deaver Stage III).

 

Thank you!