Never lift a pontoon or tritoon boat with straps. Straps will squeeze the toons and eventually put a long dent in the toons.
They've got to be supported by a rack. If you have an Express Tube, it can sit on two flat boards. With the SPS, you need it sitting on three supports. (Same goes with trailering.)
When I got my new 24SSLX (Express Tube) 2 years ago, I prefabbed a rack out of channel steel, angle iron and grade 8 bolts. Mine is 11'x18' with 5 crossmembers. I was able to carry the pieces down to the boathouse where I reassembled the rack. It's worked out great. Cost--$450. To get a marine contractor to fabricate and deliver a rack on a barge (with a crane) costs $2,000+.