Disclaimer: I am a bike amateur, so my knowledge is very limited.
I currently have an old model of the Pegasus Piazza, which I've been using for 4 years (I only replaced the saddle and the lights of my bike) to travel from my house to work and back (for a total of approximately 4km), and for small weekend-trips (up to 15km). In the last year, though, I've started to enjoy longer trips (>=60km), where sometimes I have to go through dirt roads, but definitely not super-heavy paths.
During those journeys I always had problems with the bike (a flat tire can happen, but spokes of the rear wheel breaking every time... I'm not even a huge guy, I am 1.76m x 90kg of happiness), so I grew frustrated and decided to go for a new, better one.
I started to search the web for some clues on what I'd need and eventually I found the B'twin Hoprider 700 (what's the difference between HF and LF anyway?), which I though it'd do... Unless I saw the disclaimer at the end of its website, which says:
This bike is not designed for cycling on rough terrain.
At this point I'm pretty puzzled. Most of the hybrid bikes don't have a luggage-rack, which is something I'm not willing to sacrifice, on the other hand trekking bikes are not designed for dirt roads. I can't even take mountain bikes into consideration, since I need to assume a confortable position if I have to pedal for 5-6 hours.
Is there any bicycle there that would fit my needs, or should I buy the one I saw and hope-rider (pun intended) that it doesn't break?
EDIT: I accepted the answer with the most upvotes, but let me thank everyone for their contribute, because at the end each one of you gave me some food for thoughts.
At the moment I am very polarized towards the Diamant Ubari Legere 2017 (I have yet to find some feedback from users though), which is, for the money I'm willing to spend, the bike that I find nearest to my needs.