I agree with the other guys, running loads will completely cancel out the weights work.
If you are going to hit the weights though, 5 times a week is far too much, and if you do decided to 5 anyway you will definately have to eat a helluva lot more. Further to eating more you will also need to sort out your diet. I don't know what your diet is like for obvious reasons but you need to start eating more red meat/veg and less fatty stuff like the normal sweets etc (although a 'treat day' once a week is always an option to help that.
When it comes to competition time you need to reduce the amount of calorie intake by roughly 15% but by doing this you will start to lose bits of the important stuff necessary for muscle/mass growth. From the way you're talking with the fat loss, are you wanting to burn excess fat or lose the weight which could also help especially in trials riding?
If it is the latter remember that muscle is heavier than fat and will weigh you down a bit more, but on the other side you will have increase power for the pedal kicks require for longer/higher jumps.
When it gets to the comp time as i was saying, reduce the calorie intake by 15% but you need to bump up the carbohydrate intake by about 10-15% to balance and give your (human) frame the extra oomf for the big day (especially if you want to look good in photos!).
Take a look at Damon Watson, rider for Trial Tech he's built like god knows what; but he is still one of the world's best riders. So define your aims slightly more clearly i.e.
-Fat loss
-Muslce gain
-Cardiovascular increases
to help you and also keep a record of all the exercises that you do in a 'log book' or keep a blog (like i did/ do - not that i update it very often) and take regular measurements of the key areas you're focusing on (i.e. chest, biceps/triceps, waist at the narrowest point/navel etc.
And the key thing as someone already mentioned is that to improve your riding, you need to ride; test yourself try and do bigger gaps, higher jumps etc, but play it safe too, always wear a lid and don't do something you know for certain you can't do or you'll just get hurt
Hope this helps mate