Well that Interlock is lifetime, but costs! ALOT! I'am as we speak...installing a roof using PVC roofing membranes, hot air welded. Best option for an older mobile home. Pics to follow. But, that won't help you.
Just go with shingles, That's what I would do. Architectural Roofing Shingles (some) have a lifetime warranty. Heavy as hell but I'm not carrying them up the ladder! That's what forklifts, scissor lifts and/or Roofing Conveyors are for! While your at it have a look at Gable & shed dormers....if you're starting from scratch, or a trussed loft conversion. Gives you a usable 2nd story....
Don't worry Red, I have bolt cutters....and a compound miter saw that will bring tears to your eyes!!

My contractors license is only valid in Oregon...so Limit You need to send me the requirements needed for me to secure a TN license!