I installed Torklift tie downs on my dually myself also. It's not all that hard, especially if you have a hitch receiver, as they have "side holes" to slide and clamp the rear tie downs to. The front were a bit more difficult, but not too hard. They are expensive, but you only have to do it once! I've never been a fan of the HappiJac system because I hate the thought of drilling into the bed of my truck. But that's just me. I'm not saying they are bad, just not my thing.
Whatever you do, ensure you do it right. Coming on here is the right thing to do, though you will get different opinions. The two systems are really the only way to go nowadays.
Best of luck and welcome to the site!
🙂Dak
2018 GMC Denali "Extreme" and 23' EVO 2050T Travel Trailer
Escapee member #224325-Since 1992