I've been as heavy as 18.5stone & only issues ive had is a few broken spokes. I had a Tricross & that was the worst wheels with 3 broken spokes on the rear, but Specialized replaced the back wheel under warranty & never asked about my weight. I've never even looked at max recommended weights when buying a bike. I have a Spesh Allez elite & the original wheels lasted 2 years, no broken spokes, however after about 2 years I noticed the rims cracking slightly near the spoke nipples, so I relaced them with FSA RD60 wheels (which didnt break the bank) & 4 years on they are still ok

Maybe consider going for a touring bike with drops? Surely they are designed for heavier loads, rider + camping/tourer equip?