Happijac tie downs installed! Maybe some other discussion...

Get some actual weights and post them. I carried 4000 lbs while towing 8000 lbs with a SRW, but it did take some upgrades to allow me to carry 8000 lbs on the rear axle.

My feeling is that lighter campers are fine with body mounted anchors, but once you are in that 4000 lb range, you are better off with real frame mounted anchors. It's a cost you need to factor in to a TC purchase, just like the proper receiver to use with an extension.