I need advice from those who may have used either or both systems. Just got a new KLR and need luggage. Initially I'm planning to go the 20mm ammo box route but later may opt for aluminum boxes. I have found only two mount systems - Happy Trails ($239 for their "SU" heavy duty version or $199 for their "NW" lightweight), and KLR650.com's ($233). The NW rack seems a little lightweight especially for the ammo cans, so I'm really only looking at the two more heavy duty ones. The KLR650 mount price includes shipping but the HT would add $18 shipping for a total of $257 vs. $233 for the KLR650.com. So, do the HT models have features to make them worth the extra $24? Thanks!